MCAT Biochemistry Question 116: Answer and Explanation
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Question: 116
11. Which of the following is LEAST likely to be the resting membrane potential of a cell?
- A. –70 mV
- B. –55 mV
- C. 0 mV
- D. +35 mV
Correct Answer: C
Explanation:
Cell membranes are most likely to have a resting membrane potential that is nonzero because the resting membrane potential creates a state that is capable of responding to stimuli. Signaling molecules and channels would not be as useful with a membrane potential of zero. The values given in the answer choices correspond to different stages of the action potential, but the key information is that a resting potential of 0 mV does not maintain gradients for later activity.