What is implied by «active transport»?
a) Transport of drugs trough a membrane by means of diffusion
b) Transport without energy consumption
c) Engulf of drug by a cell membrane with a new vesicle formation
d) Transport against concentration gradient
d) Transport against the concentration gradient. Active transport requires energy to move substances from an area of lower concentration to an area of higher concentration, contrary to the natural flow.
The correct answer is:
d) Transport against concentration gradient
Active transport implies the movement of molecules or substances across a cell membrane against their concentration gradient, from an area of lower concentration to an area of higher concentration. This process requires energy, usually in the form of ATP (adenosine triphosphate), to pump the molecules against their natural direction of movement.