Question 1

Which of the following statements best explains why lipids are not considered true polymers?

Accepted Answer

Lipids do not consist of repeating monomer units and are not formed by polymerization.

Question 2

A dehydration reaction is crucial in the synthesis of biological polymers. Which of the following best describes what occurs during a dehydration reaction?

Accepted Answer

A water molecule is removed, resulting in the formation of a new covalent bond between monomers.

Question 3

Which of the following macromolecules is NOT a polymer?

Accepted Answer

Lipids

Question 4

A patient is diagnosed with a genetic disorder that affects the formation of glycosidic bonds. Which class of macromolecules would be most directly affected?

Accepted Answer

Carbohydrates

Question 5

Which of the following best distinguishes an aldose sugar from a ketose sugar?

Accepted Answer

Aldose sugars have a carbonyl group at the end of the carbon skeleton, while ketose sugars have it within the carbon skeleton.

Question 6

Which of the following is the correct chemical formula for glucose, the most common monosaccharide?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 7

Which of the following best explains why cellulose cannot be digested by most animals, including humans?

Accepted Answer

Cellulose is composed of glucose monomers joined by $$\beta-1$$,4 glycosidic linkages, which most animals lack enzymes to hydrolyze.

Question 8

A biologist is studying a molecule with the formula $$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$. This molecule is most likely:

Accepted Answer

A disaccharide

Question 9

Which of the following statements about the formation of a disaccharide is correct?

Accepted Answer

A disaccharide is formed by a dehydration reaction that creates a glycosidic bond between two monosaccharides.

Question 10

Which of the following is a correct pairing of a carbohydrate type and its function in living organisms?

Accepted Answer

Glycogen: energy storage in animals

Question 11

Which of the following best describes the difference between starch and cellulose?

Accepted Answer

Starch is composed of $$\alpha-$$glucose monomers, while cellulose is composed of $$\beta-$$glucose monomers.

Question 12

Which of the following is a real-world application of hydrolysis in the human body?

Accepted Answer

The breakdown of dietary starch into glucose monomers during digestion.

Question 13

Which of the following best explains why glucose often forms a ring structure in aqueous solutions?

Accepted Answer

The carbonyl group reacts with a hydroxyl group, forming a stable ring structure.

Question 14

A scientist is analyzing a sugar and determines it has five carbons and a ketone group. Which sugar is it most likely to be?

Accepted Answer

Ribulose

Question 15

Which of the following is a correct statement about the classification of monosaccharides?

Accepted Answer

Monosaccharides are classified by the location of the carbonyl group and the number of carbons in the skeleton.

Question 16

Which of the following best describes the process shown in the second image (hydrolysis)?

Accepted Answer

A water molecule is added, breaking a bond in the polymer and releasing a monomer.

Question 17

Which of the following is a correct example of a monosaccharide, a disaccharide, and a polysaccharide, respectively?

Accepted Answer

Glucose, sucrose, cellulose

Question 18

Which of the following best explains why glycogen is more extensively branched than starch?

Accepted Answer

Glycogen's branching allows for rapid release of glucose when energy is needed in animals.

Question 19

Which of the following is a correct statement about the formation of maltose?

Accepted Answer

Maltose is formed by a dehydration reaction between two glucose molecules.

Molecules of Life: Biological Macromolecules and Carbohydrates

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