Which enzyme is secreted by the gastric glands of the stomach in an inactive form?
A. Lipase
B. Trypsin
C. Amylase
D. Pepsin
Answer: Option D
Solution (By JKExamLibrary)
Pepsin is the main digestive enzyme in the stomach. It is secreted by the chief cells (zymogenic cells) of the gastric glands in an inactive form called pepsinogen. Pepsinogen is activated into pepsin by the acidic environment created by hydrochloric acid (HCl) secreted by parietal cells. Pepsin then digests proteins into proteoses and peptones.
Explanation:
Zymase is the enzyme complex in yeast that catalyzes alcoholic fermentation, converting pyruvate to ethanol and CO₂. Invertase hydrolyzes sucrose, lactase breaks lactose, maltase breaks maltose. Zymase activity is exploited in baking and brewing industries.
Consider the following statements regarding photosynthesis:
1. Light reactions occur in the thylakoid membranes.
2. Oxygen is released from carbon dioxide.
3. ATP and NADPH are produced in the light reactions.
Which of the above is/are correct?
Explanation:
Light reactions occur in thylakoid membranes, producing ATP, NADPH, and oxygen. Oxygen comes from water (photolysis), not CO₂. So statement 2 is incorrect. 1 and 3 are correct.
Explanation:
Decomposition involves several steps. Leaching is the process where water-soluble inorganic nutrients (like nitrates, phosphates) are washed out of the decomposing organic matter (detritus) and move deep into the soil profile, where they may become unavailable to plants. Fragmentation is the breakdown of detritus by detritivores (like earthworms).
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