Question

A cell uses active transport to move molecules across a cellular membrane when

Answer 1

Answer:

In cellular biology, active transport is the movement of molecules across a membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement. There are two types of active transport: primary active transport that uses adenosine triphosphate (ATP), and secondary active transport that uses an electrochemical gradien

Explanation:

I got it off wikepedia :/

Answer 2

Answer:

A cell uses active transport to move molecules across a cellular membrane when the molecules are being moved against a concentration gradient.

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