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

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

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

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

Active transport occurs more rapidly than passive transport.

answer is B.

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Detailed Solution

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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