A process that requires cellular energy to move a substance against its concentration gradient is called
A) active transport.
B) passive transport.
C) facilitated transport.
D) osmosis.
E) diffusion.

Question

Quizplus · Accepted Answer

Passive transport, facilitated transport, osmosis, and diffusion do not require cellular energy to move substances. Active transport requires energy to move substances against their concentration gradient, which means from an area of low concentration to an area of high concentration. This process is essential for maintaining proper concentration gradients across membranes and for cellular processes such as nutrient uptake and waste removal.

A Process That Requires Cellular Energy to Move a Substance