Energy is required for active transport to occur across a cell membrane. Thus, the correct option is C.
Active transport may be defined as a type of transport that occurs against the concentration gradient. This type of transport is generally mediated by carrier proteins.
Metabolic energy is utilized to migrate ions or molecules against a concentration gradient. It results in the accumulation of solute on one side of the membrane.
Active transport is generally characterized as the movement of ions or molecules across a cell membrane into a region of a higher concentration, furnished by specific enzymes and requiring energy.
The concentration gradient is required by the type of transport known as diffusion, a passive type of transport.
Therefore, Energy is required for active transport to occur across a cell membrane. Thus, the correct option is C.
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