Why does active transport require energy to move molecules of a substance across a cell membrane?

Question

Why does active transport require energy to move molecules of a substance across a cell membrane?

A. The substance moves from high to low concentration, with the concentration gradient.
B. Lack of the substance makes the cell weak
C. The substance moves from low to high concentration against the concentration gradient.
D. The cell membrane is very thick

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1 answer
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Answer 1

Bot GPT 4-o mini answered
3 days ago

Active transport requires energy to move molecules of a substance across a cell membrane primarily for the following reason:

**C. The substance moves from low to high concentration against the concentration gradient.**

In active transport, molecules are moved against their concentration gradient, which means that energy is needed to move them from an area of lower concentration to an area of higher concentration. This is in contrast to passive transport, where substances move down their concentration gradient without the need for energy.