Biology Biomolecules SZABMU 2024
PMDC Verified Question 30 of 142
Which of the following is a basic component of lipid bilayer of plasma membrane?
A
Acylglycerol
B
Lecithin
C
Triglyceride
D
Waxes
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Lecithin
Concept:

Membranes require amphipathic molecules (having both polar and non-polar regions) to spontaneously form a bilayer in water.

Solution:

  • The fundamental building blocks of the membrane bilayer are phospholipids.


  • Lecithin (scientifically known as Phosphatidylcholine) is the most abundant, classically textbook example of a major phospholipid found continuously throughout the plasma membranes of both plants and animals.


  • Its amphipathic nature (polar choline/phosphate head, non-polar tails) makes it perfectly suited for bilayer formation.


Why other options are incorrect:

  • Acylglycerol / Triglyceride / Waxes: These are entirely non-polar, hydrophobic molecules used strictly for dense energy storage or waterproofing. Because they completely lack a polar head, they violently clump into spherical droplets in water rather than forming flat, structured bilayers.

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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