A type of transport of a solute across a membrane,up its concentration gradient,using protein carriers driven by the expenditure of chemical energy is known as
A)osmosis.
B)diffusion.
C)facilitated transport.
D)active transport.
E)exocytosis.

Question

Quizplus · Accepted Answer

Active transport is the only option that explicitly mentions the use of chemical energy to move solutes against their concentration gradient. Osmosis, diffusion, and facilitated transport all involve movement down the concentration gradient, while exocytosis involves movement out of the cell through fusion with the plasma membrane.

A Type of Transport of a Solute Across a Membrane,up