The organelle responsible for the synthesis of lipids and detoxification of drugs in liver cells is: MCQ with Answer and Explanation

The organelle responsible for the synthesis of lipids and detoxification of drugs in liver cells is:
A. Smooth endoplasmic reticulum
B. Rough endoplasmic reticulum
C. Lysosome
D. Golgi apparatus
Answer: Option A
Solution (By JKExamLibrary)
Smooth endoplasmic reticulum (SER) lacks ribosomes and is involved in lipid and steroid hormone synthesis, carbohydrate metabolism, and detoxification of drugs and poisons (via cytochrome P450 enzymes). Rough ER synthesizes proteins. Golgi modifies/packages. Lysosomes digest. Liver cells have abundant SER. SER also sequesters Ca²⁺ ions in muscle cells (sarcoplasmic reticulum).

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Practice More Biology Questions

Question #1
In the human eye, the defect of vision where the eyeball is too long or the cornea is too curved, causing light to focus in front of the retina, is called:
A. Astigmatism
B. Myopia (Nearsightedness)
C. Presbyopia
D. Hypermetropia (Farsightedness)

Correct Answer: Option B


Explanation:
Myopia, or nearsightedness, is a refractive error where distant objects appear blurry, but near objects are clear. It occurs when the eyeball is elongated (axial myopia) or the cornea/lens is too curved (refractive myopia), causing light rays from distant objects to focus in front of the retina instead of directly on it. It is corrected using a concave (diverging) lens. Hypermetropia is the opposite, corrected with a convex lens.

This question belongs to: Science Biology
Question #2
The disease caused by the deficiency of thiamine (vitamin B₁) is:
A. Pellagra
B. Rickets
C. Scurvy
D. Beriberi

Correct Answer: Option D


Explanation:
Beriberi results from lack of thiamine (B₁), affecting the nervous and cardiovascular systems. It manifests as dry beriberi (peripheral neuropathy) or wet beriberi (heart failure). Pellagra is niacin deficiency, scurvy vitamin C, rickets vitamin D. Thiamine is a coenzyme in carbohydrate metabolism.

This question belongs to: Science Biology
Question #3
Which pathogen causes tuberculosis in humans?
A. Salmonella typhi
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C. Plasmodium vivax
D. Streptococcus pneumoniae

Correct Answer: Option B


Explanation:
Tuberculosis (TB) is a bacterial infection caused by Mycobacterium tuberculosis, typically affecting the lungs. It is spread through airborne droplets. S. pneumoniae causes pneumonia, S. typhi typhoid, P. vivax malaria. TB is treated with a multi-drug regimen including isoniazid and rifampicin.

This question belongs to: Science Biology