Which of the following is true about Active transport?

Options

A. uses energy to pump molecules against the concentration gradient
B. is as active process
C. is carried out by membrane proteins
D. all of these.

Answer

D

Explanation

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.