Which part of the human digestive system produces hydrochloric acid? MCQ with Answer and Explanation

Which part of the human digestive system produces hydrochloric acid?
A. Liver
B. Pancreas
C. Parietal cells of stomach
D. Goblet cells of intestine
Answer: Option C
Solution (By JKExamLibrary)
Parietal (oxyntic) cells in the gastric glands of the stomach secrete hydrochloric acid (HCl), which activates pepsinogen to pepsin, kills bacteria, and provides an acidic pH (1.5-2.0) for protein digestion. Liver produces bile, pancreas secretes digestive enzymes and bicarbonate, goblet cells secrete mucus. Intrinsic factor, required for vitamin B₁₂ absorption, is also secreted by parietal cells.

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The organ that detoxifies alcohol and drugs is the:
A. Stomach
B. Liver
C. Kidney
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Correct Answer: Option B


Explanation:
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Question #2
Which enzyme is responsible for unwinding the DNA double helix during replication?
A. DNA polymerase
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Correct Answer: Option B


Explanation:
Helicase unwinds the DNA helix at the replication fork by breaking hydrogen bonds between base pairs. DNA polymerase adds nucleotides, ligase seals Okazaki fragments, primase synthesizes RNA primer. This coordinated action ensures accurate semi-conservative replication. Without helicase, the strands would not separate. Energy for unwinding comes from ATP hydrolysis.

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Question #3
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Correct Answer: Option B


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