Question 1

Which of the following best describes the hydrophobic effect in protein folding?

Accepted Answer

The exclusion of water by nonpolar groups, driving protein folding.

Question 2

A mutation in the gene encoding hemoglobin replaces a polar amino acid with a nonpolar one in the protein's surface. What is the most likely consequence for hemoglobin's solubility?

Accepted Answer

Solubility will decrease because nonpolar residues disrupt water interactions.

Question 3

Which statement about competitive inhibition is correct?

Accepted Answer

The inhibitor resembles the substrate and competes for the active site.

Question 4

During DNA replication, which enzyme is responsible for joining Okazaki fragments on the lagging strand?

Accepted Answer

DNA ligase

Question 5

Which of the following is NOT a difference between DNA and RNA?

Accepted Answer

DNA contains uracil, while RNA contains thymine.

Question 6

Which class of amino acids would you expect to find most frequently in the interior of a globular protein?

Accepted Answer

Nonpolar amino acids

Question 7

A patient is diagnosed with a deficiency in a water-soluble vitamin that acts as a coenzyme. Which process is most likely to be affected?

Accepted Answer

Enzyme catalysis

Question 8

Which of the following best describes the role of chaperones in protein biochemistry?

Accepted Answer

They assist in the proper folding of other proteins and prevent aggregation.

Question 9

Which of the following is a correct application of Chargaff's rules to double-stranded DNA?

Accepted Answer

The number of guanine bases equals the number of cytosine bases.

Question 10

Which process describes the loss of a protein's functional shape due to disruption of non-covalent interactions?

Accepted Answer

Denaturation

Question 11

A scientist is studying an enzyme that requires a nonprotein organic molecule derived from a water-soluble vitamin for activity. What is this molecule called?

Accepted Answer

Coenzyme

Question 12

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

DNA is transcribed into RNA, which is translated into protein.

Question 13

Which of the following is true about the alpha-helix structure in proteins?

Accepted Answer

It is stabilized by hydrogen bonds between backbone amide groups 4 residues apart.

Question 14

Which enzyme catalyzes the synthesis of new DNA during replication?

Accepted Answer

DNA polymerase

Question 15

A protein loses its function after exposure to high heat and detergent. What is the most likely explanation?

Accepted Answer

The protein underwent denaturation, disrupting non-covalent interactions.

Question 16

Which of the following is a correct description of an apoenzyme?

Accepted Answer

The protein component of an enzyme, minus its required cofactor or coenzyme.

Question 17

Which of the following is a function of histones in eukaryotic cells?

Accepted Answer

They wrap DNA to form nucleosomes, aiding in chromosome compaction.

Question 18

Which of the following best describes the induced fit model of enzyme activity?

Accepted Answer

Binding of the substrate triggers a conformational change in the enzyme's active site.

Question 19

Which of the following is true about isomers?

Accepted Answer

They have the same chemical formula but different structures.

Question 20

A mutation causes a change in the primary structure of a protein. Which level of protein structure is most directly affected?

Accepted Answer

Primary structure

Proteins, Enzymes, and Nucleic Acids: GOB Chemistry Study Guide

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