AAMC MCAT Biological and Biochemical Foundations

Question 1

Which enzyme catalyzes the rate-limiting step of glycolysis?

Accepted Answer

Phosphofructokinase-1 (PFK-1)

Answer

Hexokinase

Answer

Pyruvate kinase

Answer

Aldolase

Question 2

What is the net ATP yield from the complete oxidation of one glucose molecule?

Accepted Answer

30-32 ATP

Answer

2 ATP

Answer

38 ATP

Answer

4 ATP

Question 3

Which RNA molecule carries amino acids to the ribosome during translation?

Accepted Answer

tRNA

Answer

mRNA

Answer

rRNA

Answer

snRNA

Question 4

In competitive enzyme inhibition, what happens to Vmax and Km?

Accepted Answer

Vmax unchanged, Km increases

Answer

Vmax decreases, Km unchanged

Answer

Both decrease

Answer

Both increase

Question 5

Which organelle is responsible for post-translational protein modification and sorting?

Accepted Answer

Golgi apparatus

Answer

Smooth ER

Answer

Nucleus

Answer

Peroxisome

Question 6

What defines the primary structure of a protein?

Accepted Answer

Sequence of amino acids linked by peptide bonds

Answer

Alpha helices and beta sheets

Answer

3D folded conformation

Answer

Multiple polypeptide chain assembly