Discussion
Which of the following is a proenzyme?
Answer: A
Correct answer: Pepsinogen
A proenzyme (zymogen) is an inactive precursor activated by cleavage. Pepsinogen becomes pepsin in stomach acid; trypsinogen becomes trypsin, and chymotrypsinogen chymotrypsin. Trypsin and chymotrypsin as listed are the active forms, so they are not proenzymes.
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