Question 1

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

Accepted Answer

It has four valence electrons, allowing it to form up to four covalent bonds with other atoms.

Question 2

A molecule with the formula $$C_6H_{12}O_6$ is classified as which type of macromolecule monomer?

Accepted Answer

Monosaccharide

Question 3

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

Accepted Answer

Unsaturated fatty acids have one or more double bonds in their hydrocarbon chains, causing kinks that prevent tight packing.

Question 4

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 5

A patient is diagnosed with a genetic disorder that affects the structure of collagen, a protein found in connective tissue. Which level of protein structure is most likely disrupted in this disorder?

Accepted Answer

Quaternary structure

Question 6

Which of the following best explains why phospholipids are well-suited to form biological membranes?

Accepted Answer

They are amphipathic, containing both hydrophilic heads and hydrophobic tails.

Question 7

Which of the following statements about protein denaturation is correct?

Accepted Answer

Denaturation alters the secondary, tertiary, or quaternary structure without breaking the primary structure.

Question 8

A DNA molecule contains 30% adenine. According to base pairing rules, what percentage of the molecule is guanine?

Accepted Answer

20%

Question 9

Which of the following best describes the relationship between monomers and polymers?

Accepted Answer

Monomers are formed by the hydrolysis of polymers.

Question 10

Which of the following is a correct example of a carbohydrate polymer and its function?

Accepted Answer

Glycogen; energy storage in animals

Question 11

A scientist is studying a molecule with the following structure: a five-carbon sugar, a phosphate group, and a nitrogenous base. This molecule is a:

Accepted Answer

Nucleotide

Question 12

Which of the following best explains why enzymes are considered biological catalysts?

Accepted Answer

They speed up chemical reactions without being permanently changed.

Question 13

Which of the following is a correct pairing of a functional group and its characteristic property?

Accepted Answer

Amino group ($$-NH_2$); acts as a base

Question 14

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 15

A mutation changes a single amino acid in the primary structure of a protein. Which of the following is a possible consequence?

Accepted Answer

The protein's tertiary structure may be altered, affecting its function.

Question 16

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 17

Which of the following best describes the role of ATP synthase in cells?

Accepted Answer

It synthesizes ATP from ADP and inorganic phosphate during cellular respiration.

Question 18

Which of the following is a correct statement about the structure of a triglyceride?

Accepted Answer

It consists of three fatty acids joined to a glycerol molecule by ester bonds.

Question 19

A patient is found to have a deficiency in the enzyme lysozyme, which is involved in breaking down bacterial cell walls. Which class of macromolecule does lysozyme belong to?

Accepted Answer

Protein

Question 20

Which of the following best explains why cellulose is not digestible by humans, while starch is?

Accepted Answer

Humans lack the enzyme to break the beta-glycosidic bonds in cellulose.

The Molecules of Cells: Structure and Function of Biological Macromolecules

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