When does the cell have to use active transport?

Awhen the cell is low on energy
Bwhen the cell is in a highly concentrated solution
Cto move molecules across the membrane quickly
Dto move molecules across the membrane against a gradient

Active transport in cellular biology takes place when a cell has to move molecules or ions across the membrane from a region of lower concentration to a region of higher concentration. The cells needs to consume energy for this type of transport, which contrast with passive transport, at which the transport is in favor of the gradient and no energy input is needed.

When does the cell have to use active transport? Awhen the cell is low on energyBwhen the cell is in a highly concentrated solutionCto move molecules across the membrane quicklyDto move molecules across the membrane against a gradient

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When does the cell have to use active transport?

Awhen the cell is low on energy
Bwhen the cell is in a highly concentrated solution
Cto move molecules across the membrane quickly
Dto move molecules across the membrane against a gradient