MCAT Biochemistry Discrete Practice 2026/2027 – Practice Questions with Correct Answers | Graded A+

MCAT Biochem Discrete Practice Questions and
Correct Answers Graded A+

1. B. zwitterions: 1.1 In a neutral solution, most amino acids exist as:

A. positively charged compounds

B. zwitterions

C. negatively charged compounds

D. hydrophobic molecules
2. B. -1: 1.2 At pH 7, the charge on a glutamic acid molecule is:

A. -2

B. -1

C. 0

D. +1
3. C. They are hydrophobic and found buried within proteins.: 1.3 Which of the following
statements is most liḳely to be true of nonpolar R groups in aqueous solution?

A. They are hydrophilic and found buried within proteins.

B. They are hydrophilic and found on protein surfaces.

C. They are hydrophobic and found buried within proteins.

D. They are hydrophobic and found on protein surfaces.


,4. D. Their formation in.volves hydration reactions: 1.4 Which of these statements concerning
peptide bonds is FALSE?

A. Their formation involves a reaction between an amino group and a carboxyl group.

B. They are the primary bonds that hold amino acids together.






,C. They have partial double bound character.

D. Their formation in.volves hydration reactions
5. C. 6: 1.5 How many distinct tripeptides can be formed from one valine molecule, one alanine molecule, and one
leucine molecule?

A. 1

B. 3

C. 6

D. 27
6. A. Primary Structure: A.1.6 Which of these is most liḳely to be preserved when a protein is denatured?

A. Primary Structure

B. Secondary Structure

C. Tertiary Structure

D. Quaternary Structure
7. C. hydrogen bonds: 1.7 An alpha-helix is most liḳely to be held together by:

A. disulfide bonds

B. hydrophobic ettects

C. hydrogen bonds

D. ionic attractions between side chains



, 8. C. Moving it to a more hypotonic environment: 1.8 Which of the following is least liḳely to
cause denaturation of proteins?