Lipids

Question 1

What are lipids

Answer 1

A diverse group of insoluble molecules

Question 2

Do lipids form polymers

Answer 2

No

Question 3

Why don’t lipids form polymers

Answer 3

They have little to no affinity for water

Question 4

T/F: Lipids are hydrophobic

Answer 4

True

Question 5

Lipids consist mostly of…

Answer 5

Hydrocarbons

Question 6

What do hydrocarbons form

Answer 6

Non polar covalent bonds

Question 7

What are the 5 most biologically important lipids

Answer 7

• Fats
• Phospholipids
• Oils
• Waxes
• Steroids

Question 8

What are the two types of smaller molecules that fats are constructed by

Answer 8

• Glycerol
• Fatty Acids

Question 9

What is Glycerol

Answer 9

A three carbon-alcohol with a hydroxyl group attached to each carbon

Question 10

What is a Fatty Acid

Answer 10

Carboxyl group attached to a long carbon skeleton

Question 11

T/F: Fatty acids are all the same length

Answer 11

False; they vary in length and the number and locations of double bonds

Question 12

T/F: Unsaturated fatty acids have the maximum number of hydrogen atoms possible and no double bonds

Answer 12

False; Saturated fatty acids

Question 13

T/F: Unsaturated fatty acids have one or more double bonds

Answer 13

True

Question 14

Describe fats made from saturated fatty acids

Answer 14

• Called saturated fats
• Are solid at room temperature

Question 15

Describe fats made from unsaturated fatty acids

Answer 15

• Called unsaturated fats/ oils
• Are liquid at room temperature

Question 16

What is a major function of fats

Answer 16

Energy storage

Question 17

Where do animals store their fats

Answer 17

In adipose cells

Question 18

Describe the hydrophilic/ hydrophobic tendencies of the fatty acid molecules

Question 19

When phospholipids are added to water, they self assemble into a…

Answer 19

Lipid bilayer, with the hydrophobic tails pointing towards the interior

Question 20

Steroids are lipids characterized by a carbon skeleton consisting of… (how many rings)

Answer 20

4 fused rings

Question 21

What is an important steroid that is a component in animal cell membranes

Answer 21

Cholesterol

Question 22

What makes waxes

Answer 22

Fatty acids connected to alcohols

Question 23

What does wax resist

Answer 23

Water and degradation

Question 24

What is ear wax also known as

Answer 24

Cerumen

Question 25

What is the function of ear wax

Answer 25

Bacterial, fungal, and antiviral properties