Which one of the following statements is correct about the cell membra

Which one of the following statements is correct about the cell membrane ?

[amp_mcq option1=”It is made up of cellulose.” option2=”It is a permeable structure for all substances.” option3=”It is flexible and enables the cell to engulf many materials.” option4=”It does not allow diffusion of gases like oxygen and carbon dioxide.” correct=”option3″]

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UPSC CDS-1 – 2022

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Statement C is correct about the cell membrane.

The cell membrane is primarily composed of a lipid bilayer with embedded proteins (fluid mosaic model). This structure is flexible and allows the cell to change shape and engulf substances from the external environment through processes like endocytosis (e.g., phagocytosis and pinocytosis), which is essential for functions like nutrition or defence.

Statement A is incorrect; cellulose is the main component of the plant cell wall, not the cell membrane. Statement B is incorrect; the cell membrane is selectively permeable, meaning it controls which substances can pass through it. Statement D is incorrect; small nonpolar molecules like oxygen and carbon dioxide can readily diffuse across the lipid bilayer of the cell membrane.

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