Active transport...

Active transport

uses energy to pump molecules against the concentration gradient

is an active process

is carried out by membrane proteins

all of these.

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Active transport is the transport of solute linked with some metabolic reaction (or reactions) involving expenditure of energy. The molecules or ions, in active transport, cross a protoplasmic membrane (viz, plasma membrane, tonoplast, etc.) against the chemical potential (concentration) gradient. This kind of transport is carried out by membrane proteins.

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