Several digestive enzymes are secreted as zymogens because ________.
A. they act only in the stomach lumen and do not digest intracellular proteins
B. they can start digesting dietary proteins more quickly
C. they start digesting intracellular proteins of the gastric cells more quickly
D. gastric cells do not have the necessary enzymes for their synthesis
E. it saves one step in their synthesis
Answer: A
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