Question 1

Which of the following 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 of the following is a nonhydrolyzable lipid?

Accepted Answer

an eicosanoid

Question 4

What functional group is contained in most hydrolyzable lipids?

Accepted Answer

ester

Question 5

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

Accepted Answer

hydrophobic regions

Question 6

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

Accepted Answer

omega-3 acid

Question 7

Which compound has the highest melting point?

Accepted Answer

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

Question 8

Which compound has the lowest melting point?

Accepted Answer

$$\mathrm{CH_3$(CH_2$)_4CH=CH(CH_2$)_4CH=CH(CH_2$)_2CH=CH(CH_2$)_2COOH}$$

Question 9

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

Accepted Answer

enzymes

Question 10

Which statement concerning lipid functions is incorrect?

Accepted Answer

Plants and animals use waxes for insulation.

Question 11

Fats and oils are both triacylglycerols, but fats are solids at room temperature and oils are liquids. Why?

Accepted Answer

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

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

Phosphoacylglycerols (glycerophospholipids) can interact with both water and other lipids. Which statement best explains this behavior?

Accepted Answer

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

Question 15

Which structure represents the steroid skeleton?

Accepted Answer

Image 1

Question 16

Which structure is a sphingomyelin?

Accepted Answer

Image 6

Question 17

Which cartoon best represents the structure of a phospholipid?

Accepted Answer

Image 13

Question 18

Which of the following statements about fatty acids is TRUE?

Accepted Answer

The number of double bonds in a fatty acid affects the melting point.

Identifying the Steroid Skeleton in Lipid Chemistry

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