Which part of the small intestine is the main site of nutrient absorption? MCQ with Answer and Explanation

Which part of the small intestine is the main site of nutrient absorption?
A. Colon
B. Ileum
C. Duodenum
D. Jejunum
Answer: Option D
Solution (By JKSSB Mock Tests)
The jejunum, with its long villi and microvilli, is the primary site for absorption of digested nutrients. The ileum also absorbs vitamin B₁₂ and bile salts.

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The hormone that lowers blood calcium by depositing it in bones is:
A. Thyroxine
B. Parathyroid hormone
C. Insulin
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Correct Answer: Option D


Explanation:
Calcitonin, secreted by the thyroid gland, reduces blood calcium by inhibiting osteoclast activity and promoting calcium deposition in bones. Parathyroid hormone raises calcium. Thyroxine regulates metabolism, insulin lowers blood glucose.

This question belongs to: Science Biology
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The process of protein folding that is assisted by chaperone proteins occurs in the:
A. Golgi apparatus
B. Lysosome
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Correct Answer: Option C


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Chaperone proteins like BiP assist in proper protein folding in the rough ER. Misfolded proteins are degraded. Golgi modifies, lysosome digests.

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The pigment that gives blue-green algae their color is:
A. Chlorophyll b
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Correct Answer: Option D


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