Biology Cell SZABMU 2023
PMDC Verified Question 36 of 143
Which part of plasma membrane controls the fluidity of the membrane?
A
Glycoprotein
B
Carbohydrates
C
Carrier protein
D
Lipid
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Lipid
Concept: Membrane fluidity is essential for cell function, transport, and cell division.

Solution: The lipid component—specifically the ratio of saturated (straight) to unsaturated (kinked) fatty acid tails of phospholipids, along with intercalated cholesterol molecules—directly controls how rigidly or fluidly the membrane behaves at varying temperatures.

Distractor Autopsy: Proteins function in transport and signaling. Carbohydrates (on glycoproteins/glycolipids) function in cell-cell recognition.

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