Biology Cell NUMS 2022
PMDC Verified Question 76 of 143
The ____ part of plasma membrane controls the fluidity of the membrane.
A
Carrier proteins
B
Glycoprotein
C
Lipids
D
Carbohydrates
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Lipids
Concept: Membrane fluidity is highly dependent on temperature and the chemical structure of its hydrophobic core.

Solution: The lipids (specifically, the ratio of saturated to unsaturated fatty acid tails in phospholipids, and the presence of cholesterol) primarily control the fluidity of the membrane. Unsaturated tails create kinks that prevent tight packing, keeping it fluid.

Distractor Autopsy: Proteins dictate membrane function (transport, signaling), while carbohydrates dictate cell recognition.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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