MCAT Biology Question 67: Answer and Explanation
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Question: 67
7. Which of the following hormones is NOT derived from cholesterol?
- A. Aldosterone
- B. Estrogen
- C. Oxytocin
- D. Progesterone
Correct Answer: C
Explanation:
Steroid hormones are derived from cholesterol. Many of their names end with –one, –ol, or –oid, and they include the hormones of the adrenal cortex and gonads. Aldosterone is a mineralocorticoid from the adrenal cortex, while estrogen and progesterone are sex hormones from the ovaries, eliminating choices (A), (B), and (D). Oxytocin is a peptide hormone and is thus not derived from cholesterol. Peptide and amino acid-derivative hormones often end with –in or –ine.