Which is the best definition of active transport?
A) Movement of molecules from higher concentration to lower concentration
B) Movement of water across a semi-permeable membrane from high water concentration to lower water concentration
C) Movement of molecules from lower concentration to higher concentration
D) Movement of a substance against its concentration through the release of energy from ATP

Question

Quizplus · Accepted Answer

Active transport is the movement of a substance against its concentration gradient, meaning from lower concentration to higher concentration. This process requires energy to be expended, typically in the form of ATP. This differs from passive transport, which involves the movement of substances down their concentration gradient from higher to lower concentration. Option A describes passive transport. Option B describes osmosis, which is a type of passive transport. Option C is the inverse of active transport and describes a process that does not occur naturally without the input of energy.

Which Is the Best Definition of Active Transport