The fluid mosaic model describes the structure of which cellular component? MCQ with Answer and Explanation

The fluid mosaic model describes the structure of which cellular component?
A. Plasma membrane
B. Cell wall
C. Nucleus
D. Ribosome
Answer: Option A
Solution (By JKSSB Mock Tests)
The fluid mosaic model, proposed by Singer and Nicolson (1972), describes the plasma membrane as a phospholipid bilayer with proteins floating like icebergs in a sea of lipids. It accounts for membrane fluidity and selective permeability. The cell wall is rigid, nucleus has a double membrane, ribosome is a ribonucleoprotein complex.

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Practice More Biology Questions

Question #1
The vitamin that is a coenzyme in the decarboxylation of pyruvate to acetyl-CoA is:
A. Riboflavin (B₂)
B. Thiamine (B₁)
C. Niacin (B₃)
D. Pyridoxine (B₆)

Correct Answer: Option B


Explanation:
Thiamine pyrophosphate (TPP), derived from vitamin B₁, is a cofactor for pyruvate dehydrogenase, which catalyzes the oxidative decarboxylation of pyruvate to acetyl-CoA. Riboflavin is FAD, niacin is NAD, pyridoxine PLP for transamination.

This question belongs to: Science Biology
Question #2
Identify the correct statement about blood groups:
A. Group O has both A and B antigens.
B. Group A has anti-B antibodies.
C. Rh factor is unrelated to pregnancy complications.
D. Group AB is the universal donor.

Correct Answer: Option B


Explanation:
Blood group A has A antigens and anti-B antibodies. Group O has no antigens, AB is universal recipient, Rh incompatibility can cause erythroblastosis fetalis.

This question belongs to: Science Biology
Question #3
The symbiotic relationship where one organism benefits and the other is unaffected is:
A. Predation
B. Commensalism
C. Mutualism
D. Parasitism

Correct Answer: Option B


Explanation:
Commensalism (+/0) involves one species benefiting and the other neither harmed nor helped. Example: barnacles on a whale, or cattle egrets eating insects stirred by cattle. Mutualism benefits both (+/+), parasitism benefits one at expense of other (+/-), predation (+/-) involves killing. The distinction is based on the net effect.

This question belongs to: Science Biology