A carrier protein is required
A)for passive transport.
B)for active transport.
C)to move water.
D)for passive transport and to move water.

Question

Quizplus · Accepted Answer

Carrier proteins are required for active transport, in which molecules move against their concentration gradient, from an area of low concentration to an area of high concentration. In contrast, passive transport does not require a carrier protein as molecules move along their concentration gradient, from an area of high concentration to an area of low concentration. While some carrier proteins can facilitate the movement of water, this is not their primary function.

A Carrier Protein Is Required