MCAT Biology Question 126: Answer and Explanation
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Question: 126
6. Which of the following choices INCORRECTLY pairs a digestive enzyme with its site of secretion?
- A. Sucrase—salivary glands
- B. Carboxypeptidase—pancreas
- C. Trypsin—pancreas
- D. Lactase—duodenum
Correct Answer: A
Explanation:
Sucrase is a brush-border enzyme found on duodenal cells and is not secreted by the salivary glands. This enzyme hydrolyzes sucrose (a disaccharide) to form glucose and fructose (monosaccharides). The other associations are all correct.