In ______________,carrier molecules move a substance against (up)the concentration gradient.
A)facilitated diffusion
B)simple diffusion
C)endocytosis
D)active transport
E)exocytosis

Question

Quizplus · Accepted Answer

In active transport, carrier molecules move a substance against the concentration gradient, requiring the input of energy in the form of ATP. Facilitated diffusion moves substances down the concentration gradient, simple diffusion moves substances from high to low concentration without the aid of carrier molecules, endocytosis and exocytosis both involve the movement of large molecules or groups of molecules into or out of the cell, but are not specific to movement against the concentration gradient.

In ______________,Carrier Molecules Move a Substance Against (Up)the Concentration Gradient