Question 1

Which of the following statements best explains why lipids are considered hydrophobic molecules?

Accepted Answer

Lipids are composed mainly of nonpolar C-C and C-H covalent bonds, resulting in poor solubility in water.

Question 2

A triglyceride is formed by joining three fatty acids to a glycerol molecule. What type of chemical reaction is responsible for this process?

Accepted Answer

Dehydration reaction

Question 3

Which of the following best describes the structure of a phospholipid and its behavior in water?

Accepted Answer

Phospholipids have a hydrophilic head and two hydrophobic tails, forming bilayers in water.

Question 4

Which equation correctly represents the formation of a triglyceride from glycerol and three fatty acids?

Accepted Answer

$$\mathrm{Glycerol} + 3\ \mathrm{Fatty\ acids} \rightarrow \mathrm{Triglyceride} + 3\ \mathrm{H_2O}$$

Question 5

Which of the following is a major function of triglycerides in animals?

Accepted Answer

Long-term energy storage

Question 6

A fatty acid with no double bonds between carbon atoms is classified as:

Accepted Answer

Saturated

Question 7

Which of the following statements about unsaturated fats is correct?

Accepted Answer

Unsaturated fats contain one or more double bonds, causing kinks in the fatty acid tails.

Question 8

Which of the following best explains why phospholipids spontaneously form bilayers in water?

Accepted Answer

The hydrophilic heads interact with water, while the hydrophobic tails avoid water.

Question 9

Steroids are a class of lipids. Which structural feature distinguishes steroids from other lipids?

Accepted Answer

Steroids consist of four fused carbon rings.

Question 10

Which of the following is NOT a biologically important lipid?

Accepted Answer

Polysaccharide

Question 11

Fatty acids are described as amphipathic molecules. What does this mean?

Accepted Answer

They contain both hydrophobic and hydrophilic regions.

Question 12

Which of the following statements about hydrophobic interactions is correct?

Accepted Answer

Hydrophobic interactions cause nonpolar molecules to aggregate and exclude water.

Question 13

Which of the following is a correct comparison between saturated and unsaturated fats?

Accepted Answer

Saturated fats are solid at room temperature, while unsaturated fats are liquid.

Question 14

Which of the following is an example of a steroid?

Accepted Answer

Cholesterol

Question 15

Which of the following statements about the energy content of fats compared to carbohydrates is correct?

Accepted Answer

Fats store more energy per gram than carbohydrates.

Question 16

Which of the following is true about the ester linkage in triglycerides?

Accepted Answer

It is formed by a dehydration reaction between the hydroxyl group of glycerol and the carboxyl group of a fatty acid.

Question 17

Which of the following best describes the role of adipose tissue in mammals?

Accepted Answer

Adipose tissue cushions vital organs and insulates the body.

Question 18

Which of the following statements about the structure of fatty acids is correct?

Accepted Answer

Fatty acids consist of a long hydrocarbon chain attached to a carboxyl group.

Question 19

Which of the following would most likely increase the fluidity of a cell membrane?

Accepted Answer

Increasing the proportion of unsaturated fatty acids in phospholipids.

Question 20

A student is given a model of a lipid and asked to identify its type. The molecule has a glycerol backbone, two fatty acid tails, and a phosphate group. What type of lipid is this?

Accepted Answer

Phospholipid

Biology 1001: Building Biological Molecules – Lipids

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