MCAT Biochemistry Question 166: Answer and Explanation

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Question: 166

1. Adding heat to a closed biological system will do all of the following EXCEPT:

A. increase the internal energy of the system.
B. increase the average of the vibrational, rotational, and translational energies.
C. cause the system to do work to maintain a fixed internal energy.
D. increase the enthalpy of the system.

Correct Answer: C

Explanation:

In a closed biological system, enthalpy, heat, and internal energy are all directly related because there is no change in pressure or volume. Because pressure and volume are fixed, work cannot be done, thus choice (C) is correct.

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