Which transport system can move an ion across the plasma membrane against its concentration gradient without using ATP?
A) Secondary active transport
B) Primary active transport
C) Simple diffusion
D) Facilitated diffusion
E) Facilitated diffusion via a carrier protein

Question

Quizplus · Accepted Answer

Secondary active transport moves ions against their concentration gradient by using the energy from the movement of another substance down its gradient, not directly using ATP.

Which Transport System Can Move an Ion Across the Plasma