Question 1

Which of the following is NOT a major function of proteins in the human body?

Accepted Answer

Being the preferential energy source for the body.

Question 2

Which statement about enzymes is correct?

Accepted Answer

Enzymes are functional proteins which bring molecules together, or split them apart in chemical reactions.

Question 3

A patient is suffering from a genetic disorder that affects the structure of collagen. Which major function of proteins is most directly impacted?

Accepted Answer

Providing structure for the body.

Question 4

Which of the following best describes what happens to a protein during denaturation?

Accepted Answer

The protein loses its secondary, tertiary, or quaternary structure but retains its primary structure.

Question 5

Which of the following equations best represents the general reaction catalyzed by an enzyme?

Accepted Answer

$$E + S \rightarrow ES \rightarrow E + P$$

Question 6

A diet lacking in essential amino acids will most directly affect which process?

Accepted Answer

Synthesis of new proteins.

Question 7

Which of the following is a common misconception about proteins?

Accepted Answer

Proteins are the preferential energy source for the body.

Question 8

Which of the following statements about nonessential amino acids is correct?

Accepted Answer

They can be synthesized by the body and are commonly used to make proteins.

Question 9

A denatured enzyme is most likely to lose which property?

Accepted Answer

Its catalytic activity.

Question 10

Which of the following best explains why proteins are not the body's preferential energy source?

Accepted Answer

Proteins have important structural and functional roles that would be compromised if used for energy.

Question 11

Which of the following is a direct consequence of protein denaturation in food preparation (e.g., cooking an egg)?

Accepted Answer

Loss of the protein's natural function but retention of its nutritional value.

Question 12

Which of the following is the correct sequence of protein structural levels from simplest to most complex?

Accepted Answer

Primary $$ \rightarrow $$ Secondary $$ \rightarrow $$ Tertiary $$ \rightarrow $$ Quaternary

Biochemistry: Protein Structure and Function – Guided Study

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