Which statement about active transport is correct?
Answer and explanation
Correct answer: C. It moves substances against the concentration gradient and needs energy
- Step 1: Active transport is carried out by carrier proteins in the membrane.
- Step 2: It uses ATP from respiration to move substances against the gradient.
Answer
It moves substances against the concentration gradient and needs energy.
Why not the others: It moves substances down the concentration gradient without energy: this describes diffusion. It only moves water molecules: active transport moves ions and other solutes. It only happens in plants: it happens in animal and plant cells.
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