Question 1

Which of the following compounds is NOT an example of a lipid?

Accepted Answer

Phenol

Question 2

Which of the following is a hydrolyzable lipid?

Accepted Answer

A triacylglycerol

Question 3

Which functional group is contained in most hydrolyzable lipids?

Accepted Answer

Ester

Question 4

The structure of lipids is dominated by which type of region?

Accepted Answer

Hydrophobic regions

Question 5

Linolenic acid is best described as which type of omega fatty acid?

Accepted Answer

Omega-3 acid

Question 6

Which compound has the highest melting point?

Accepted Answer

$$\mathrm{CH_3$(CH_2$)_{14}COOH}$$

Question 7

Hydrolysis of triacylglycerols in the body occurs with the aid of which reagent?

Accepted Answer

Enzymes

Question 8

Which structural feature is NOT found in sphingomyelins?

Accepted Answer

A glycerol backbone

Question 9

What is the main component of the cell membrane?

Accepted Answer

Phospholipids

Question 10

Which statement best explains why phosphoacylglycerols can interact with both water and other lipids?

Accepted Answer

They contain both a hydrophobic region as well as a hydrophilic region.

Question 11

Which cartoon best represents the structure of a phospholipid?

Accepted Answer

A diagram showing a glycerol backbone, two fatty acids, a phosphate group, and an amino alcohol.

Question 12

What hydrolysis products are formed when the wax $$\mathrm{CH_3$(CH_2$)_{18}COO(CH_2$)_{17}CH_3$} is $$treated with aqueous sulfuric acid?

Accepted Answer

$$\mathrm{CH_3$(CH_2$)_{18}COOH + CH_3$(CH_2$)_{16}CH_2OH}$$

Question 13

What wax is formed from palmitic acid $$\mathrm{CH_3$(CH_2$)_{14}COOH}$$ and the alcohol $$\mathrm{CH_3$(CH_2$)_{21}OH}$$?

Accepted Answer

$$\mathrm{CH_3$(CH_2$)_{14}COO(CH_2$)_{21}CH_3$}$$

Question 14

Fats and oils are both triacylglycerols, but fats are solids at room temperature and oils are liquids. Which statement best describes the reason for their difference in physical state?

Accepted Answer

Fats contain a higher percentage of saturated fatty acids than oils do, and therefore have higher melting points than oils.

Question 15

Which statement concerning lipid functions is incorrect?

Accepted Answer

Plants and animals use waxes for insulation.

Question 16

Which structure is the steroid skeleton? (Refer to the images provided.)

Accepted Answer

Image 1

Question 17

Which structure is a sphingomyelin? (Refer to the images provided.)

Accepted Answer

Image 6

Question 18

Which structure is a prostaglandin? (Refer to the images provided.)

Accepted Answer

Image 11

Question 19

Which compound is best classified as a fatty acid? (Refer to the images provided.)

Accepted Answer

Image 14

Identifying the Steroid Skeleton in Lipid Chemistry

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