Question 1

Which property of carbon most directly explains its ability to form a wide variety of complex organic molecules?

Accepted Answer

It can form up to four covalent bonds, including single, double, and triple bonds.

Question 2

A dehydration reaction is essential in the formation of which type of biological molecule?

Accepted Answer

Polysaccharides from monosaccharides

Question 3

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 4

Which functional group is characteristic of carbohydrates and is involved in forming glycosidic bonds?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 5

A student is analyzing a molecule with the formula $$C_{6}H$$_{12}$$O_{6}$. Which class of biomolecule does this most likely represent?

Accepted Answer

A monosaccharide

Question 6

Which of the following best explains why cellulose and starch, both polymers of glucose, have different properties?

Accepted Answer

Cellulose has $$\beta-1$$,4 glycosidic linkages, while starch has $$\alpha-1$$,4 glycosidic linkages.

Question 7

Which of the following molecules is most likely to be hydrophobic?

Accepted Answer

A molecule with a long hydrocarbon chain and few or no polar groups

Question 8

During the hydrolysis of a disaccharide, which of the following occurs?

Accepted Answer

A water molecule is added, breaking a glycosidic bond.

Question 9

Which of the following best describes the structure of a phospholipid?

Accepted Answer

A glycerol molecule bonded to two fatty acids and a phosphate group

Question 10

A molecule contains a carboxyl group ($$-COOH) $$and a long hydrocarbon chain. Which type of biological molecule is this most likely to be?

Accepted Answer

A fatty acid

Question 11

Which of the following is a correct statement about the role of polysaccharides in living organisms?

Accepted Answer

Polysaccharides can serve as both energy storage (e.g., glycogen, starch) and structural support (e.g., cellulose, chitin).

Question 12

Which of the following best explains why unsaturated fats are liquid at room temperature?

Accepted Answer

Their double bonds create kinks in the fatty acid chains, preventing tight packing.

Question 13

Which of the following is NOT a way that carbon skeletons can vary to promote molecular diversity?

Accepted Answer

Type of peptide bond formed

Question 14

A patient is found to have a genetic disorder that prevents the formation of ester linkages. Which class of biomolecules would be most directly affected?

Accepted Answer

Lipids (such as triglycerides and phospholipids)

Question 15

Which of the following best describes a glycosidic bond?

Accepted Answer

A covalent bond formed between two monosaccharides via a dehydration reaction

Question 16

Which of the following functional groups is found in both carbohydrates and lipids?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 17

A molecule is composed of four fused carbon rings with various functional groups attached. Which type of molecule is this?

Accepted Answer

A steroid

Question 18

Which of the following best explains why glucose and fructose, both with the formula $$C_6H_{12}O_6$, have different properties?

Accepted Answer

They are structural isomers, differing in the arrangement of atoms.

Question 19

Which of the following statements about the formation of biological polymers is correct?

Accepted Answer

Polymers are formed by dehydration reactions, which remove water to form covalent bonds.

Question 20

A researcher is studying a molecule that is amphipathic, with both hydrophilic and hydrophobic regions. Which of the following is most likely to be amphipathic?

Accepted Answer

A phospholipid

Carbon, Carbohydrates, and Lipids: Structure and Function in Biology

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