Question

lets find out how much you know about this topic! this will help us personalize your learning experience, and dont worry, it wont affect your grades. question 5 of 10 a key characteristic of active transport across a cell membrane is that it: moves substances against their concentration or electrochemical gradient, requiring energy. always involves the movement of water molecules via osmosis without energy input. occurs spontaneously for all types of molecules without the need for membrane proteins.

Explanation:

Active transport is a process where substances move against their concentration or electrochemical gradient and requires energy input, usually in the form of ATP. Osmosis is a passive - transport process related to water movement, and spontaneous movement of molecules without membrane proteins is diffusion.

Answer:

Moves substances against their concentration or electrochemical gradient, requiring energy.