UNIT 1: Lipids

Question 1

Lipids

Answer 1

A class of molecules that are generally small in side (often not considered a macromolecule) and do not include true polymers.

• Composed of C,H, and O, but O is found in small quantities.
• Nonpolar (hydrophobic) due to less partial charges from a lack of oxygen.

Question 2

Fats

Answer 2

Composed of glycerol and fatty acids.

Question 3

Fatty Acids

Answer 3

Long carbon chains with a carboxyl group at one end.

• Saturated: No double bonds
• Unsaturated: Contains one or more double bond and may kink.

Question 4

Glycerol

Answer 4

Classified as an alcohol due to it’s hydroxyl groups.

Question 5

Tri-glycerides

Answer 5

3 fatty acids joined to a glycerol by an ester linkage bond between a hydroxyl and a carboxyl group.

Question 6

Phospholipids

Answer 6

A major component of cell membranes that assemble as a bilayer of H2O and are composed of 2 fatty acids attached to a glycerol and a phosphate.

• Contain a hydrophobic tail and a hydrophilic head
• Polar due to charges

Question 7

Hydrophobic

Answer 7

Nonpolar = hates water

Question 8

Hydrophilic

Answer 8

Polar = loves water

Question 9

Steroids

Answer 9

Lipids that have very few oxygens and four fused rings. Groups attached to the rings determine the type of steroid.

EX: Testosterone