Biology Cell AJK 2019
PMDC Verified Question 108 of 143
The fluid mosaic model of cell membrane is:
A
Carbohydrate chains are attached with phospholipid bilayer
B
In which protein molecules are free to move about in a fluid bilayer of phospholipid molecules
C
Phospholipid bilayer is enclosed in protein layer
D
Protein layers having scattered phospholipids
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: In which protein molecules are free to move about in a fluid bilayer of phospholipid molecules
Concept: The currently accepted model of the cell membrane emphasizes dynamic movement rather than a static sandwich structure.

Solution: Proposed by Singer and Nicolson, the Fluid Mosaic Model states that the membrane is a fluid bilayer of phospholipids in which various protein molecules are embedded and are free to move laterally, much like icebergs in a sea.

Distractor Autopsy: Options suggesting a "protein layer enclosing lipids" describe the obsolete Davson-Danielli (sandwich) model.

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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