MCAT Biochemistry Question 112: Answer and Explanation
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Question: 112
7. A membrane receptor is most likely to be a(n):
- A. embedded protein with catalytic activity.
- B. transmembrane protein with sequestration activity.
- C. membrane-associated protein with sequestration activity.
- D. transmembrane protein with catalytic activity.
Correct Answer: D
Explanation:
Membrane receptors must have both an extracellular and intracellular domain; therefore, they are considered transmembrane proteins. In order to initiate a second messenger cascade, they typically display enzymatic activity, though some may act strictly as channels.