Answer:
A cell uses active transport to move molecules across a cellular membrane when the molecules are being moved against a concentration gradient.
Please mark me the brainliest
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 :/
