Answer:
In active transport, molecules move across the plasma membrane against their concentration gradient.
Step-by-step explanation:
One of the methods through which molecules move into the cells is known as the active transport. Active transport can be described as a phenomenon in which molecules move from lower concentration towards higher concentration across the membrane of the cell. Hence, it is a phenomenon which occurs against the concentration gradient.
FoR active transport to occur, the cell needs energy which is usually utilized in the form the ATP.