MCAT Biochemistry Question 39: Answer and Explanation

Home > MCAT Test > MCAT biochemistry practice tests

Test Information

Use your browser's back button to return to your test results.
Do more MCAT biochemistry practice tests.

Question: 39

9. Which of the following is NOT a component of all trimeric G proteins?

A. G_α
B. G_β
C. G_γ
D. G_i

Correct Answer: D

Explanation:

All trimeric G proteins have α, β, and γ subunits—choices (A), (B), and (C), respectively. G_s, G_i, and G_q are subtypes of the G_α subunit of the trimeric G protein and differ depending on the G protein-coupled receptor’s function.

Previous Next