What transport process uses the energy stored in a Na⁺ or H⁺ concentration gradient to drive other substances across the membrane against their own concentration gradients? A)primary active transport B)secondary active transport C)facilitated diffusion D)passive diffusion E)osmosis

Question

Quizplus · Accepted Answer

Secondary active transport utilizes the energy stored in a concentration gradient of one molecule to move a different molecule against its concentration gradient. In this case, the gradient of either Na+ or H+ is being used to transport another molecule across the membrane. Primary active transport uses ATP hydrolysis to directly move molecules against their concentration gradients, while facilitated diffusion and passive diffusion rely on the concentration gradient itself for movement. Osmosis is the movement of water across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

What Transport Process Uses the Energy Stored in a Na+

What Transport Process Uses the Energy Stored in a Na⁺