Question 1

Which property of carbon most directly explains its ability to form large, complex, and diverse molecules essential for life?

Accepted Answer

Its ability to form up to four covalent bonds with other atoms

Question 2

Which functional group is responsible for the acidic properties of amino acids and fatty acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 3

A molecule with the formula $$C_{6}H$$_{12}$$O_{6}$ is classified as which type of carbohydrate?

Accepted Answer

Monosaccharide

Question 4

Which of the following best describes a dehydration reaction in biological systems?

Accepted Answer

A reaction that synthesizes polymers from monomers by removing a water molecule

Question 5

Which type of isomerism is illustrated by molecules that are mirror images of each other, such as L- and D-glucose?

Accepted Answer

Enantiomerism

Question 6

Which of the following statements about saturated and unsaturated fatty acids is correct?

Accepted Answer

Saturated fatty acids have no double bonds and are usually solid at room temperature

Question 7

What is the main structural difference between starch and cellulose?

Accepted Answer

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

Question 8

Which functional group is found in all amino acids and is essential for peptide bond formation?

Accepted Answer

Amino group ($$-NH_2$)

Question 9

A triglyceride is formed by the reaction of which molecules?

Accepted Answer

Three fatty acids and one glycerol

Question 10

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

Accepted Answer

They have both hydrophilic heads and hydrophobic tails, causing them to arrange with heads facing water and tails away from water

Question 11

Which type of bond is responsible for the primary structure of a protein?

Accepted Answer

Peptide bonds

Question 12

Which level of protein structure is stabilized primarily by interactions between R-groups (side chains)?

Accepted Answer

Tertiary structure

Question 13

Which of the following is a correct description of a nucleotide?

Accepted Answer

A nitrogenous base, a pentose sugar, and a phosphate group

Question 14

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose

Question 15

Which functional group is most likely to participate in disulfide bond formation, stabilizing protein tertiary structure?

Accepted Answer

Sulfhydryl group ($$-SH)$$

Question 16

Which of the following best describes the difference between an aldose and a ketose sugar?

Accepted Answer

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

Question 17

Which of the following is a correct example of a dehydration synthesis reaction?

Accepted Answer

Glucose + Fructose $$\rightarrow$$ Sucrose + $$H_2O$$

Question 18

Which of the following is NOT considered a true polymer?

Accepted Answer

Lipid

Question 19

Which of the following best explains why humans can digest starch but not cellulose?

Accepted Answer

Humans have enzymes that hydrolyze $$\alpha-$$glycosidic linkages in starch, but lack enzymes for $$\beta-$$glycosidic linkages in cellulose

Carbon and the Molecular Diversity of Life: Functional Groups, Isomerism, and Macromolecules (chapter 3)

Study Guide - Practice Questions