The movement of substances through the cell membrane against their concentration gradient is a type of ________ process.
A) active
B) passive
C) diffusion
D) filtration

Question

Quizplus · Accepted Answer

Movement of substances against their concentration gradient requires energy, so it is an active process. Passive transport occurs when substances move with their concentration gradient without the need for energy. Diffusion is a type of passive transport, and filtration involves the movement of substances through a membrane based on size and pressure differences, but not necessarily against their concentration gradient.

The Movement of Substances Through the Cell Membrane Against Their