Active tramsportA. uses energy to pump molecules against the concentration gradientB. is as active processC. is carried out by membrane proteinsD. all of these.

Active tramsportA. uses energy to pump molecules against the concentra

1.	Active tramsportA. uses energy to pump molecules against the concentration gradientB. is as active processC. is carried out by membrane proteinsD. all of these.
Answer» Correct Answer - D 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 protplasmic membrane (viz, plasma membrane, tonoplast, etc.) against the chemical potential (concentration) gradient. This kind of transport is carried out by membrace proteins.

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