Substances can enter a cell either with or against the concentration gradient by __________ transport, which is powered by ________.
A)passive; electrolytes
B)passive; ATP
C)active; electrolytes
D)active; ATP

Question

Quizplus · Accepted Answer

Active transport requires energy in the form of ATP to move substances against their concentration gradient. Passive transport, as the name suggests, does not require energy and can occur with or against the concentration gradient. Electrolytes are not directly involved in the transport process.

Substances Can Enter a Cell Either with or Against the Concentration