MCAT Biology Question 121: Answer and Explanation
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Question: 121
1. Which of the following associations correctly matches a gastric cell with a compound it secretes?
- A. G cells—HCl
- B. Chief cells—pepsinogen
- C. Parietal cells—alkaline mucus
- D. Mucous cells—intrinsic factor
Correct Answer: B
Explanation:
Chief cells secrete pepsinogen, a protease secreted as a zymogen that is activated by the acidic environment of the stomach. G cells secrete gastrin, parietal cells secrete hydrochloric acid and intrinsic factor, and mucous cells secrete alkaline mucus, eliminating the other answer choices.