Why is pepsin is secreted as a zymogen?
because it saves one step in its synthesis
so it will start digesting intracellular proteins of the chief cells more quickly
so it acts only in the stomach lumen and does not digest intracellular proteins
so it can start digesting dietary proteins more quickly
The Correct Answer is C
A. Because it saves one step in its synthesis: Zymogen secretion is about preventing premature activation, not simplifying synthesis.
B. So it will start digesting intracellular proteins of the chief cells more quickly: This would be harmful-zymogens prevent self-digestion of the cells that produce them.
C. So it acts only in the stomach lumen and does not digest intracellular proteins: Pepsin is secreted as inactive pepsinogen to prevent it from digesting the proteins inside chief cells. It is only activated to pepsin in the acidic environment of the stomach lumen.
D. So it can start digesting dietary proteins more quickly: Speed is not the reason for secreting it as a zymogen-safety is.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Lipolysis, glycogenolysis, beta oxidation: These refer to fat and glycogen metabolism, not the complete oxidation of glucose.
B. Glycolysis, citric acid (Krebs) cycle, electron transport chain, oxidative phosphorylation: This is the correct and complete pathway for glucose metabolism leading to ATP production.
C. Glycogenesis, lipogenesis, electron transport chain: Glycogenesis and lipogenesis are anabolic processes, not catabolic.
D. Gluconeogenesis, citric acid (Krebs) cycle, lipolysis: These are mixed pathways that do not directly represent glucose oxidation.
Correct Answer is A
Explanation
True: When the ECF becomes hypertonic due to water loss (e.g., dehydration), water moves out of the cells into the ECF by osmosis, causing cellular shrinkage.
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