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Q.

The main difference between active and passive transport across cell membrane is :

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a

Passive transport is non-selective whereas active transport is selective.

b

Passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes.

c

Passive transport is confined to anionic carrier proteins whereas active transport is confined to cationic channel proteins.

d

Active transport occurs more rapidly than passive transport.

answer is B.

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Detailed Solution

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In simple and facilitated diffusion, molecules move from their higher concentration  to their lower concentration without utilizing energy. Active transport uses energy  to transport molecules against the concentration gradient.

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