Multiple choice

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

  1. passive transport is due to the concentration gradient across the cell membrane, whereas active transport is due to metabolic energy

  2. active transport is more rapid than passive transport

  3. passive transport is confined to anions, whereas active transport is confined to cations only

  4. passive transport is non-selective
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A Correct answer
Explanation

Passive transport moves substances down their concentration gradient without energy input, while active transport requires metabolic energy (ATP) to move substances against their concentration gradient. This is the fundamental distinction between these two membrane transport mechanisms.

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