1.5: Lipids

Question 1

Lipids are a varied group of substances that share the following characteristics:

1. They contain what?

Answer 1

Lipids contain:

1. Carbon
2. Hydrogen
3. Oxygen

Question 2

Lipids are a varied group of substances that share the following characteristics:

1. Lipids contain carbon, hydrogen and oxygen.
2. The proportion of oxygen to carbon and hydrogen is what?

Answer 2

The proportion of oxygen to:

1. Carbon
2. Hydrogen

is smaller than in carbohydrates

Question 3

Lipids are a varied group of substances that share the following characteristics:

1. Lipids contain carbon, hydrogen and oxygen.
2. The proportion of oxygen to carbon and hydrogen is smaller than in carbohydrates.
3. They are what in water?

Answer 3

Lipids are insoluble in water

Question 4

Lipids are a varied group of substances that share the following characteristics:

1. Lipids contain carbon, hydrogen and oxygen.
2. The proportion of oxygen to carbon and hydrogen is smaller than in carbohydrates.
3. Lipids are insoluble in water.
4. They are soluble in what?

Answer 4

Lipids are soluble in organic solvents

Question 5

Lipids are a varied group of substances that share the following characteristics:

1. Lipids contain carbon, hydrogen and oxygen.
2. The proportion of oxygen to carbon and hydrogen is smaller than in carbohydrates.
3. Lipids are insoluble in water.
4. They are soluble in organic solvents, such as what?

Answer 5

Lipids are soluble in organic solvents, such as:

1. Alcohols
2. Acetone

Question 6

The main groups of lipids are what?

Answer 6

The main groups of lipids are:

1. Triglycerides
2. Phospholipids

Question 7

The main groups of lipids are triglycerides, which are what, and phospholipids?

Answer 7

The main groups of lipids are triglycerides:

1. Fats
2. Oils

,and phospholipids

Question 8

Triglyceride

Answer 8

A triglyceride is an individual lipid molecule made up of:

1. A glycerol molecule
2. 3 fatty acids

Question 9

Fats are generally made of what fatty acids?

Answer 9

Fats are generally made of saturated fatty acids

Question 10

Fats are generally made of saturated fatty acids, while oils are made of what?

Answer 10

1. Fats are generally made of saturated fatty acids

,while

2. Oils are made of unsaturated fatty acids

Question 11

Fats are generally made of saturated fatty acids, while oils are made of unsaturated fatty acids.

Fats are solid at room temperature, whereas oils are what?

Answer 11

1. Fats are solid at room temperature

,whereas

2. Oils are liquid

Question 12

Lipids have many roles.

One role of lipids is in cell what?

Answer 12

One role of lipids is in cell membranes

Question 13

Lipids have many roles.

One role of lipids is in cell membranes, as what?

Answer 13

One role of lipids is in cell membranes, as:

1. Cell-surface membranes
2. Membranes around organelles

Question 14

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the what of cell membranes?

Answer 14

Phospholipids contribute to the flexibility of cell membranes

Question 15

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the flexibility of cell membranes and the transfer of what across them?

Answer 15

Phospholipids contribute to the:

1. Flexibility of cell membranes
2. Transfer of lipid-soluble substances across them

Question 16

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them.

Other roles of lipids include:

1. Lipids are a source of what?

Answer 16

Lipids are a source of energy

Question 17

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them.

Other roles of lipids include:

1. Lipids are a source of energy.

When oxidised, what do lipids do?

Answer 17

When oxidised, lipids:

1. Provide more than twice the energy as the same mass of carbohydrate
2. Release valuable water

Question 18

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them.

Other roles of lipids include:

1. Lipids are a source of energy.

When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water.

2. Lipids can be what?

Answer 18

Lipids can be waterproofing

Question 19

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them.

Other roles of lipids include:

1. Lipids are a source of energy.

When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water.

2. Lipids can be waterproofing.

Lipids are insoluble in water and therefore useful in waterproofing.

Both plants and insects have what?

Answer 19

Both plants and insects have:

1. Waxy
2. Lipid

cuticles

Question 20

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them.

Other roles of lipids include:

1. Lipids are a source of energy.

When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water.

2. Lipids can be waterproofing.

Lipids are insoluble in water and therefore useful in waterproofing.

Both plants and insects have waxy, lipid cuticles that do what?

Answer 20

Both:

1. Plants
2. Insects

have waxy, lipid cuticles that conserve water

Question 21

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them.

Other roles of lipids include:

1. Lipids are a source of energy.

When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water.

2. Lipids can be waterproofing. Lipids are insoluble in water and therefore useful in waterproofing.

Both plants and insects have waxy, lipid cuticles that conserve water, while mammals produce what?

Answer 21

Both:

1. Plants
2. Insects

have waxy, lipid cuticles that conserve water, while mammals produce an oily secretion from the sebaceous glands in the skin

Question 22

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them.

Other roles of lipids include:

1. Lipids are a source of energy.

When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water.

2. Lipids can be waterproofing. Lipids are insoluble in water and therefore useful in waterproofing.

Both plants and insects have waxy, lipid cuticles that conserve water, while mammals produce an oily secretion from the sebaceous glands in the skin.

3. Lipids can be used for i?

Answer 22

Lipids can be used for insulation

Question 23

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them.

Other roles of lipids include:

1. Lipids are a source of energy.

When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water.

2. Lipids can be waterproofing.

Lipids are insoluble in water and therefore useful in waterproofing.

Both plants and insects have waxy, lipid cuticles that conserve water, while mammals produce an oily secretion from the sebaceous glands in the skin.

3. Lipids can be used for insulation.

Fats are slow conductors of what?

Answer 23

Fats are slow conductors of heat

Question 24

Lipids have many roles.

One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles.

Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them.

Other roles of lipids include:

1. Lipids are a source of energy.

When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water.

2. Lipids can be waterproofing. Lipids are insoluble in water and therefore useful in waterproofing.

Both plants and insects have waxy, lipid cuticles that conserve water, while mammals produce an oily secretion from the sebaceous glands in the skin.

3. Lipids can be used for insulation.

Fats are slow conductors of heat and when stored beneath the body surface help to do what?

Answer 24

Fats are slow conductors of heat and when stored beneath the body surface help to retain body heat

Question 25

Lipids have many roles. One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles. Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them. Other roles of lipids include: 1. Lipids are a source of energy. When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water. 2. Lipids can be waterproofing. Lipids are insoluble in water and therefore useful in waterproofing. Both plants and insects have waxy, lipid cuticles that conserve water, while mammals produce an oily secretion from the sebaceous glands in the skin. 3. Lipids can be used for insulation. Fats are slow conductors of heat and when stored beneath the body surface help to retain body heat. Lipids also act as electrical insulators where?

Answer 25

Lipids also act as electrical insulators in the myelin sheath around nerve cells

Question 26

Lipids have many roles. One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles. Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them. Other roles of lipids include: 1. Lipids are a source of energy. When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water. 2. Lipids can be waterproofing. Lipids are insoluble in water and therefore useful in waterproofing. Both plants and insects have waxy, lipid cuticles that conserve water, while mammals produce an oily secretion from the sebaceous glands in the skin. 3. Lipids can be used for insulation. Fats are slow conductors of heat and when stored beneath the body surface help to retain body heat. Lipids also act as electrical insulators in the myelin sheath around nerve cells. 4. Lipids can be used for p?

Answer 26

Lipids can be used for protection

Question 27

Lipids have many roles. One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles. Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them. Other roles of lipids include: 1. Lipids are a source of energy. When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water. 2. Lipids can be waterproofing. Lipids are insoluble in water and therefore useful in waterproofing. Both plants and insects have waxy, lipid cuticles that conserve water, while mammals produce an oily secretion from the sebaceous glands in the skin. 3. Lipids can be used for insulation. Fats are slow conductors of heat and when stored beneath the body surface help to retain body heat. Lipids also act as electrical insulators in the myelin sheath around nerve cells. 4. Lipids can be used for protection. Fat is often stored where?

Answer 27

Fat is often stored around delicate organs

Question 28

Lipids have many roles. One role of lipids is in cell membranes, as cell-surface membranes and membranes around organelles. Phospholipids contribute to the flexibility of cell membranes and the transfer of lipid-soluble substances across them. Other roles of lipids include: 1. Lipids are a source of energy. When oxidised, lipids provide more than twice the energy as the same mass of carbohydrate and release valuable water. 2. Lipids can be waterproofing. Lipids are insoluble in water and therefore useful in waterproofing. Both plants and insects have waxy, lipid cuticles that conserve water, while mammals produce an oily secretion from the sebaceous glands in the skin. 3. Lipids can be used for insulation. Fats are slow conductors of heat and when stored beneath the body surface help to retain body heat. Lipids also act as electrical insulators in the myelin sheath around nerve cells. 4. Lipids can be used for protection. Fat is often stored around delicate organs, such as what?

Answer 28

Fat is often stored around delicate organs, such as the kidney

Question 29

Room temperature

Answer 29

Room temperature is 10 - 20 degrees Celsius

Question 30

Triglycerides are so called because they have what?

Answer 30

Triglycerides are so called because they have 3 (tri) fatty acids combined with glycerol (glyceride)

Question 31

Triglycerides are so called because they have 3 (tri) fatty acids combined with glycerol (glyceride). Each fatty acid does what?

Answer 31

Each fatty acid in triglycerides forms an ester bond with glycerol in a condensation reaction

Question 32

Triglycerides are so called because they have 3 (tri) fatty acids combined with glycerol (glyceride). Each fatty acid forms an ester bond with glycerol in a condensation reaction. Hydrolysis of a triglyceride therefore produces what?

Answer 32

Hydrolysis of a triglyceride therefore produces: 1. 3 fatty acids 2. Glycerol

Question 33

Triglycerides are so called because they have 3 (tri) fatty acids combined with glycerol (glyceride). Each fatty acid forms an ester bond with glycerol in a condensation reaction. The 3 fatty acids may all be the same, thereby forming a what?

Answer 33

The 3 fatty acids may all be the same, thereby forming a simple triglyceride

Question 34

Triglycerides are so called because they have 3 (tri) fatty acids combined with glycerol (glyceride). Each fatty acid forms an ester bond with glycerol in a condensation reaction. The 3 fatty acids may all be the same, thereby forming a simple triglyceride or the 3 fatty acids may be different, in which case what is produced?

Answer 34

The 3 fatty acids may: 1. All be the same, thereby forming a simple triglyceride Or, 2. Be different, in which case a mixed triglyceride is produced

Question 35

Triglycerides are so called because they have 3 (tri) fatty acids combined with glycerol (glyceride). Each fatty acid forms an ester bond with glycerol in a condensation reaction. The 3 fatty acids may all be the same, thereby forming a simple triglyceride or the 3 fatty acids may be different, in which case a mixed triglyceride is produced. In either case, it is what?

Answer 35

In either case, it is a condensation reaction

Question 36

The glycerol molecule in all triglycerides is what?

Answer 36

The glycerol molecule in all triglycerides is the same

Question 37

As the glycerol molecule in all triglycerides is the same, the differences in the properties of different fats and oils come from what?

Answer 37

As the glycerol molecule in all triglycerides is the same, the differences in the properties of different: 1. Fats 2. Oils come from variations in the fatty acids

Question 38

As the glycerol molecule in all triglycerides is the same, the differences in the properties of different fats and oils come from variations in the fatty acids. There are how many different fatty acids?

Answer 38

There are over 70 different fatty acids

Question 39

As the glycerol molecule in all triglycerides is the same, the differences in the properties of different fats and oils come from variations in the fatty acids. There are over 70 different fatty acids and all have what?

Answer 39

There are over 70 different fatty acids and all have a carboxyl (-COOH) group with a hydrocarbon chain attached

Question 40

As the glycerol molecule in all triglycerides is the same, the differences in the properties of different fats and oils come from variations in the fatty acids. There are over 70 different fatty acids and all have a carboxyl (-COOH) group with a hydrocarbon chain attached. If this chain has no carbon-carbon double bonds, the fatty acid is then described as what?

Answer 40

If this chain has no carbon-carbon double bonds, the fatty acid is then described as saturated

Question 41

As the glycerol molecule in all triglycerides is the same, the differences in the properties of different fats and oils come from variations in the fatty acids. There are over 70 different fatty acids and all have a carboxyl (-COOH) group with a hydrocarbon chain attached. If this chain has no carbon-carbon double bonds, the fatty acid is then described as saturated, because what?

Answer 41

If this chain has no carbon-carbon double bonds, the fatty acid is then described as saturated, because all the carbon atoms are linked to the maximum possible number of hydrogen atoms

Question 42

As the glycerol molecule in all triglycerides is the same, the differences in the properties of different fats and oils come from variations in the fatty acids. There are over 70 different fatty acids and all have a carboxyl (-COOH) group with a hydrocarbon chain attached. If this chain has no carbon-carbon double bonds, the fatty acid is then described as saturated, because all the carbon atoms are linked to the maximum possible number of hydrogen atoms. In other words, all the carbon atoms are what?

Answer 42

In other words, all the carbon atoms are saturated with hydrogen atoms

Question 43

As the glycerol molecule in all triglycerides is the same, the differences in the properties of different fats and oils come from variations in the fatty acids. There are over 70 different fatty acids and all have a carboxyl (-COOH) group with a hydrocarbon chain attached. If this chain has no carbon-carbon double bonds, the fatty acid is then described as saturated, because all the carbon atoms are linked to the maximum possible number of hydrogen atoms. In other words, all the carbon atoms are saturated with hydrogen atoms. If there is a single double bond, the fatty acid is what?

Answer 43

If there is a single double bond, the fatty acid is mono-unsaturated

Question 44

As the glycerol molecule in all triglycerides is the same, the differences in the properties of different fats and oils come from variations in the fatty acids. There are over 70 different fatty acids and all have a carboxyl (-COOH) group with a hydrocarbon chain attached. If this chain has no carbon-carbon double bonds, the fatty acid is then described as saturated, because all the carbon atoms are linked to the maximum possible number of hydrogen atoms. In other words, all the carbon atoms are saturated with hydrogen atoms. If there is a single double bond, the fatty acid is mono-unsaturated. If more than one double bond is present, the fatty acid is what?

Answer 44

If more than one double bond is present, the fatty acid is polyunsaturated

Question 45

Polyunsaturated, more than one double bond between carbon atoms. The double bonds cause the molecule to do what?

Answer 45

The double bonds cause the molecule to bend

Question 46

Polyunsaturated, more than one double bond between carbon atoms. The double bonds cause the molecule to bend. They cannot therefore do what?

Answer 46

The molecules cannot therefore pack together so closely

Question 47

Polyunsaturated, more than one double bond between carbon atoms. The double bonds cause the molecule to bend. The molecules cannot therefore pack together so closely, making them what?

Answer 47

The molecules cannot therefore pack together so closely, making them liquid at room temperature

Question 48

Polyunsaturated, more than one double bond between carbon atoms. The double bonds cause the molecule to bend. The molecules cannot therefore pack together so closely, making them liquid at room temperature. Example

Answer 48

For example, they are oils

Question 49

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of what?

Answer 49

Triglycerides have a high ratio of: 1. Energy-storing carbon-hydrogen bonds to 2. Carbon atoms

Question 50

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms and are therefore an excellent source of what?

Answer 50

Triglycerides: 1. Have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms 2. Are therefore an excellent source of energy

Question 51

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms and are therefore an excellent source of energy. 2. Triglycerides have a low what?

Answer 51

Triglycerides have a low: 1. Mass to 2. Energy ratio

Question 52

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms and are therefore an excellent source of energy. 2. Triglycerides have a low mass to energy ratio, making them good what?

Answer 52

Triglycerides have a low mass to energy ratio, making them good storage molecules

Question 53

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms and are therefore an excellent source of energy. 2. Triglycerides have a low mass to energy ratio, making them good storage molecules, because what?

Answer 53

Triglycerides have a low mass to energy ratio, making them good storage molecules, because much energy can be stored in a small volume

Question 54

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms and are therefore an excellent source of energy. 2. Triglycerides have a low mass to energy ratio, making them good storage molecules, because much energy can be stored in a small volume. This is especially beneficial to animals, because it what?

Answer 54

This is especially beneficial to animals, because it reduces the mass they have to carry as they move around

Question 55

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms and are therefore an excellent source of energy. 2. Triglycerides have a low mass to energy ratio, making them good storage molecules, because much energy can be stored in a small volume. This is especially beneficial to animals, because it reduces the mass they have to carry as they move around. 3. Being large, non-polar molecules, triglycerides are what?

Answer 55

Being: 1. Large 2. Non-polar molecules, triglycerides are insoluble in water

Question 56

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms and are therefore an excellent source of energy. 2. Triglycerides have a low mass to energy ratio, making them good storage molecules, because much energy can be stored in a small volume. This is especially beneficial to animals, because it reduces the mass they have to carry as they move around. 3. Being large, non-polar molecules, triglycerides are insoluble in water. As a result, their storage does not affect what?

Answer 56

As a result, their storage does not affect: 1. Osmosis in cells Or, 2. The water potential of them

Question 57

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms and are therefore an excellent source of energy. 2. Triglycerides have a low mass to energy ratio, making them good storage molecules, because much energy can be stored in a small volume. This is especially beneficial to animals, because it reduces the mass they have to carry as they move around. 3. Being large, non-polar molecules, triglycerides are insoluble in water. As a result, their storage does not affect osmosis in cells or the water potential of them. 4. As triglycerides have a high ratio of hydrogen to oxygen atoms, they do what when oxidised?

Answer 57

As triglycerides have a high ratio of: 1. Hydrogen to 2. Oxygen atoms, they release water when oxidised

Question 58

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms and are therefore an excellent source of energy. 2. Triglycerides have a low mass to energy ratio, making them good storage molecules, because much energy can be stored in a small volume. This is especially beneficial to animals, because it reduces the mass they have to carry as they move around. 3. Being large, non-polar molecules, triglycerides are insoluble in water. As a result, their storage does not affect osmosis in cells or the water potential of them. 4. As triglycerides have a high ratio of hydrogen to oxygen atoms, they release water when oxidised and therefore provide an important source of what?

Answer 58

As triglycerides have a high ratio of hydrogen to oxygen atoms, they: 1. Release water when oxidised 2. Therefore provide an important source of water

Question 59

The structure of triglycerides related to their properties: 1. Triglycerides have a high ratio of energy-storing carbon-hydrogen bonds to carbon atoms and are therefore an excellent source of energy. 2. Triglycerides have a low mass to energy ratio, making them good storage molecules, because much energy can be stored in a small volume. This is especially beneficial to animals, because it reduces the mass they have to carry as they move around. 3. Being large, non-polar molecules, triglycerides are insoluble in water. As a result, their storage does not affect osmosis in cells or the water potential of them. 4. As triglycerides have a high ratio of hydrogen to oxygen atoms, they release water when oxidised and therefore provide an important source of water, especially for who?

Answer 59

As triglycerides have a high ratio of hydrogen to oxygen atoms, they: 1. Release water when oxidised 2. Therefore provide an important source of water, especially for organisms living in dry deserts

Question 60

Water potential

Answer 60

Water potential is the: 1. Pressure created by water molecules 2. Measure of the extent to which a solution gives out water

Question 61

Water potential is the pressure created by water molecules and the measure of the extent to which a solution gives out water. The greater the number of water molecules present, what?

Answer 61

The greater the number of water molecules present, the higher (less negative) the water potential

Question 62

Water potential is the pressure created by water molecules and the measure of the extent to which a solution gives out water. The greater the number of water molecules present, the higher (less negative) the water potential. Pure water has a water potential of what?

Answer 62

Pure water has a water potential of 0

Question 63

Phospholipids are similar to lipids except that what?

Answer 63

Phospholipids are similar to lipids except that one of the fatty acid molecules is replaced by a phosphate molecule

Question 64

Phospholipids are similar to lipids except that one of the fatty acid molecules is replaced by a phosphate molecule. Fatty acid molecules do what to water?

Answer 64

Fatty acid molecules repel water

Question 65

Phospholipids are similar to lipids except that one of the fatty acid molecules is replaced by a phosphate molecule. Fatty acid molecules repel water and so are what?

Answer 65

Fatty acid molecules: 1. Repel water 2. So are hydrophobic

Question 66

Phospholipids are similar to lipids except that one of the fatty acid molecules is replaced by a phosphate molecule. Whereas fatty acid molecules repel water and so are hydrophobic, phosphate molecules do what to water?

Answer 66

Whereas fatty acid molecules: 1. Repel water 2. So are hydrophobic ,phosphate molecules attract water

Question 67

Phospholipids are similar to lipids except that one of the fatty acid molecules is replaced by a phosphate molecule. Whereas fatty acid molecules repel water and so are hydrophobic, phosphate molecules attract water and so are what?

Answer 67

Whereas fatty acid molecules repel water and so are hydrophobic, phosphate molecules: 1. Attract water 2. So are hydrophilic

Question 68

Phospholipids are similar to lipids except that one of the fatty acid molecules is replaced by a phosphate molecule. Whereas fatty acid molecules repel water and so are hydrophobic, phosphate molecules attract water and so are hydrophilic. A phospholipid is therefore made up of what?

Answer 68

A phospholipid is therefore made up of 2 parts, a: 1. Hydrophilic 'head' 2. Hydrophobic 'tail'

Question 69

Phospholipids are similar to lipids except that one of the fatty acid molecules is replaced by a phosphate molecule. Whereas fatty acid molecules repel water and so are hydrophobic, phosphate molecules attract water and so are hydrophilic. A phospholipid is therefore made up of 2 parts, a hydrophilic 'head,' which does what, and a hydrophobic 'tail?'

Answer 69

A phospholipid is therefore made up of 2 parts, a: 1. Hydrophilic 'head,' which interacts with water (is attracted to it), but not with fat 2. Hydrophobic 'tail'

Question 70

Phospholipids are similar to lipids except that one of the fatty acid molecules is replaced by a phosphate molecule. Whereas fatty acid molecules repel water and so are hydrophobic, phosphate molecules attract water and so are hydrophilic. A phospholipid is therefore made up of 2 parts, a hydrophilic 'head,' which interacts with water (is attracted to it), but not with fat, and a hydrophobic 'tail,' which does what?

Answer 70

A phospholipid is therefore made up of 2 parts, a: 1. Hydrophilic 'head,' which interacts with water (is attracted to it), but not with fat 2. Hydrophobic 'tail,' which orients itself away from water, but mixes readily with fat

Question 71

Phospholipids are similar to lipids except that one of the fatty acid molecules is replaced by a phosphate molecule. Whereas fatty acid molecules repel water and so are hydrophobic, phosphate molecules attract water and so are hydrophilic. A phospholipid is therefore made up of 2 parts, a hydrophilic 'head,' which interacts with water (is attracted to it), but not with fat, and a hydrophobic 'tail,' which orients itself away from water, but mixes readily with fat. Molecules that have 2 ends (poles) that behave differently in this way are said to be what?

Answer 71

Molecules that have 2 ends (poles) that behave differently in this way are said to be polar

Question 72

Phospholipids are similar to lipids except that one of the fatty acid molecules is replaced by a phosphate molecule. Whereas fatty acid molecules repel water and so are hydrophobic, phosphate molecules attract water and so are hydrophilic. A phospholipid is therefore made up of 2 parts, a hydrophilic 'head,' which interacts with water (is attracted to it), but not with fat, and a hydrophobic 'tail,' which orients itself away from water, but mixes readily with fat. Molecules that have 2 ends (poles) that behave differently in this way are said to be polar. This means that when these polar phospholipid molecules are placed in water they do what?

Answer 72

This means that when these polar phospholipid molecules are placed in water they position themselves so that the: 1. Hydrophilic heads are as close to the water as possible 2. Hydrophobic tails are as far away from the water as possible

Question 73

The structure of phospholipids related to their properties: 1. Phospholipids are polar molecules, having a hydrophilic what head and a hydrophobic tail of what?

Answer 73

Phospholipids are polar molecules, having a: 1. Hydrophilic phosphate head 2. Hydrophobic tail of 2 fatty acids

Question 74

The structure of phospholipids related to their properties: 1. Phospholipids are polar molecules, having a hydrophilic phosphate head and a hydrophobic tail of 2 fatty acids. This means that in an aqueous environment, phospholipid molecules do what?

Answer 74

This means that in an aqueous environment, phospholipid molecules form a bilayer within cell-surface membranes

Question 75

The structure of phospholipids related to their properties: 1. Phospholipids are polar molecules, having a hydrophilic phosphate head and a hydrophobic tail of 2 fatty acids. This means that in an aqueous environment, phospholipid molecules form a bilayer within cell-surface membranes. As a result, what happens?

Answer 75

As a result, a hydrophobic barrier is formed between the: 1. Inside 2. Outside of a cell

Question 76

The structure of phospholipids related to their properties: 1. Phospholipids are polar molecules, having a hydrophilic phosphate head and a hydrophobic tail of 2 fatty acids. This means that in an aqueous environment, phospholipid molecules form a bilayer within cell-surface membranes. As a result, a hydrophobic barrier is formed between the inside and outside of a cell. 2. The hydrophilic phosphate 'heads' of phospholipid molecules help to do what?

Answer 76

The hydrophilic phosphate 'heads' of phospholipid molecules help to hold at the surface of the cell-surface membrane

Question 77

The structure of phospholipids related to their properties: 1. Phospholipids are polar molecules, having a hydrophilic phosphate head and a hydrophobic tail of 2 fatty acids. This means that in an aqueous environment, phospholipid molecules form a bilayer within cell-surface membranes. As a result, a hydrophobic barrier is formed between the inside and outside of a cell. 2. The hydrophilic phosphate 'heads' of phospholipid molecules help to hold at the surface of the cell-surface membrane. 3. The phospholipid structure allows phospholipids to form what?

Answer 77

The phospholipid structure allows phospholipids to form glycolipids

Question 78

The structure of phospholipids related to their properties: 1. Phospholipids are polar molecules, having a hydrophilic phosphate head and a hydrophobic tail of 2 fatty acids. This means that in an aqueous environment, phospholipid molecules form a bilayer within cell-surface membranes. As a result, a hydrophobic barrier is formed between the inside and outside of a cell. 2. The hydrophilic phosphate 'heads' of phospholipid molecules help to hold at the surface of the cell-surface membrane. 3. The phospholipid structure allows phospholipids to form glycolipids by doing what?

Answer 78

The phospholipid structure allows phospholipids to form glycolipids by combining with carbohydrates within the cell-surface membrane

Question 79

The structure of phospholipids related to their properties: 1. Phospholipids are polar molecules, having a hydrophilic phosphate head and a hydrophobic tail of 2 fatty acids. This means that in an aqueous environment, phospholipid molecules form a bilayer within cell-surface membranes. As a result, a hydrophobic barrier is formed between the inside and outside of a cell. 2. The hydrophilic phosphate 'heads' of phospholipid molecules help to hold at the surface of the cell-surface membrane. 3. The phospholipid structure allows phospholipids to form glycolipids by combining with carbohydrates within the cell-surface membrane. These glycolipids are important in what?

Answer 79

These glycolipids are important in cell recognition

Question 80

The test for lipids is known as what?

Answer 80

The test for lipids is known as the emulsion test

Question 81

The test for lipids is known as the emulsion test and is carried out as you: Take a what?

Answer 81

Take a: 1. Completely dry 2. Grease-free test tube

Question 82

The test for lipids is known as the emulsion test and is carried out as you: Take a completely dry and grease-free test tube. Add what to what?

Answer 82

Add 5cm³ of ethanol to 2cm³ of the sample being tested

Question 83

The test for lipids is known as the emulsion test and is carried out as you: Take a completely dry and grease-free test tube. Add 5cm³ of ethanol to 2cm³ of the sample being tested. Shake the tube how to do what?

Answer 83

Shake the tube thoroughly to dissolve any lipid in the sample

Question 84

The test for lipids is known as the emulsion test and is carried out as you: Take a completely dry and grease-free test tube. Add 5cm³ of ethanol to 2cm³ of the sample being tested. Shake the tube thoroughly to dissolve any lipid in the sample. Add what and do what?

Answer 84

1. Add 5cm³ of water 2. Shake gently

Question 85

The test for lipids is known as the emulsion test and is carried out as you: Take a completely dry and grease-free test tube. Add 5cm³ of ethanol to 2cm³ of the sample being tested. Shake the tube thoroughly to dissolve any lipid in the sample. Add 5cm³ of water and shake gently. What indicates the presence of a lipid?

Answer 85

A cloudy-white colour indicates the presence of a lipid

Question 86

The test for lipids is known as the emulsion test and is carried out as you: Take a completely dry and grease-free test tube. Add 5cm³ of ethanol to 2cm³ of the sample being tested. Shake the tube thoroughly to dissolve any lipid in the sample. Add 5cm³ of water and shake gently. A cloudy-white colour indicates the presence of a lipid. As a control, do what?

Answer 86

As a control, repeat the procedures using water instead of the sample

Question 87

The test for lipids is known as the emulsion test and is carried out as you: Take a completely dry and grease-free test tube. Add 5cm³ of ethanol to 2cm³ of the sample being tested. Shake the tube thoroughly to dissolve any lipid in the sample. Add 5cm³ of water and shake gently. A cloudy-white colour indicates the presence of a lipid. As a control, repeat the procedures using water instead of the sample. The final solution should do what?

Answer 87

The final solution should remain clear

Question 88

The test for lipids is known as the emulsion test. A cloudy-white colour indicates the presence of a lipid. The cloudy colour is due to what?

Answer 88

The cloudy colour is due to any lipid in the sample being finely dispersed in the water to form an emulsion

Question 89

The test for lipids is known as the emulsion test. A cloudy-white colour indicates the presence of a lipid. The cloudy colour is due to any lipid in the sample being finely dispersed in the water to form an emulsion. Light passing through this emulsion is what?

Answer 89

Light passing through this emulsion is refracted

Question 90

The test for lipids is known as the emulsion test. A cloudy-white colour indicates the presence of a lipid. The cloudy colour is due to any lipid in the sample being finely dispersed in the water to form an emulsion. Light passing through this emulsion is refracted as it does what?

Answer 90

Light passing through this emulsion is refracted as it passes from: 1. Oil droplets to 2. Water droplets

Question 91

The test for lipids is known as the emulsion test. A cloudy-white colour indicates the presence of a lipid. The cloudy colour is due to any lipid in the sample being finely dispersed in the water to form an emulsion. Light passing through this emulsion is refracted as it passes from oil droplets to water droplets, making the emulsion appear what?

Answer 91

Light passing through this emulsion is refracted as it passes from oil droplets to water droplets, making the emulsion appear cloudy

Question 92

An amphipathic molecule

Answer 92

An amphipathic molecule is a molecule that has both: 1. Polar 2. Non-polar regions

Question 93

Phospholipids are what molecules?

Answer 93

Phospholipids are amphipathic molecules

Question 94

Phospholipids are amphipathic molecules. They have a what head?

Answer 94

Phospholipids have a hydrophilic head

Question 95

Phospholipids are amphipathic molecules. They have a hydrophilic head made up of what?

Answer 95

Phospholipids have a hydrophilic head made up of: 1. Glycerol 2. Phosphate

Question 96

Phospholipids are amphipathic molecules. They have a hydrophilic head made up of glycerol and phosphate and a what tail?

Answer 96

Phospholipids have a: 1. Hydrophilic head made up of glycerol and phosphate 2. Hydrophobic tail

Question 97

Phospholipids are amphipathic molecules. They have a hydrophilic head made up of glycerol and phosphate and a hydrophobic tail made up of what?

Answer 97

Phospholipids have a: 1. Hydrophilic head made up of glycerol and phosphate 2. Hydrophobic tail made up of 2 fatty acids

Question 98

What does a mixed saturated and unsaturated lipid look like?

Answer 98

Question 99

What is the phospholipid symbol?

Answer 99