Biology Cell KMDC 2014
PMDC Verified Question 141 of 143
Which substance from the following is important for the mechanical stability of cell membranes, as without it membranes quickly break and cells burst open? The hydrophobic region of these molecules help to prevent ion or polar molecules from passing through the cell membrane?
A
Cholesterol
B
Glycolipids
C
Phospholipids
D
Protein
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Phospholipids
Concept: The fundamental structural framework of all biological membranes is a lipid bilayer.

Solution: Phospholipids form a continuous bilayer. Their hydrophobic tails face inward, preventing the free passage of water-soluble ions and polar molecules. This bilayer provides the essential mechanical barrier and stability of the cell.

Distractor Autopsy: While cholesterol modulates fluidity and stability, the fundamental structure that prevents the cell from bursting open and acts as the primary barrier is the phospholipid bilayer itself.

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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