In passive processes, substances move across the plasma membrane 1. with the use of ATP
2) up (or against) a concentration gradient
3) down (or along) a pressure gradient
4) equally in all directions
A) 3 only
B) 2 only
C) 1, 2, 3
D) 2, 3, 4

Question

Quizplus · Accepted Answer

Passive processes involve the movement of substances down their concentration or pressure gradients without the use of energy (ATP), hence option 3 is correct.

In Passive Processes, Substances Move Across the Plasma Membrane 1