MCAT Biochemistry Question 63: Answer and Explanation
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Question: 63
3. Which of the following best describes the structure of steroids?
- A. Three cyclopentane rings, one cyclohexane ring
- B. Three cyclohexane rings, one cyclopentane ring
- C. Four carbon rings, differing in structure for each steroid
- D. Three cyclic carbon rings and a functional group
Correct Answer: B
Explanation:
The basic backbone of steroid structure contains three cyclohexane rings and one cyclopentane ring. Although the oxidation status of these rings varies for different steroids, the overall structure does not, as in choice (C).