Question

question
which of the following describes active transport? select all that apply.
a. it does not require energy expenditure.
b. it uses energy from the breakdown of atp.
c. a substance is moved down its concentration gradient.
d. a substance is moved against its concentration gradient.

Explanation:

Active transport is a cellular process that uses energy (from ATP breakdown) to move substances against their concentration gradient. Passive transport, on the other hand, does not require energy and moves substances down their concentration gradient.

Answer:

B. It uses energy from the breakdown of ATP.
D. A substance is moved against its concentration gradient.