The correct statement about active transport is:
b) It requires energy.
Active transport is the process by which substances move across a cell membrane against their concentration gradient, which means from an area of lower concentration to an area of higher concentration. This process requires energy, typically in the form of ATP.
To clarify the other options:
- a) It moves substances down the concentration gradient: This is false; active transport moves substances against their concentration gradient.
- c) It does not use ATP: This is also false; active transport does use ATP or other forms of energy.
- d) It moves material from high to low concentration: This is false; it moves material from low to high concentration.
Therefore, the only true statement is that active transport requires energy.
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