Question

Which best describes why active transport requires atp to move molecules across the cell membrane?

Answer 1

Answer:

B. Molecules are moved against the concentration gradient.

Explanation:

Due to the higher concentration of the molecules of one of the sides than the other,in order to move molecules from the side with higher concentration of molecules to the side of lower concentration of molecules which is against the movement of molecules across the membrane, energy must be applied i.e atp.