Molecules which are transported across the membrane against their concentration gradient, i.e., from the lower to higher concentration . Such a transport is called

Options

A. Active transport, e.g., diffusion
B. Passive transport, e.g., diffusion
C. Active transport, e.g., `Na^(2+) /K^(+)` pump
D. Osmosis, a type of simple diffusion

Answer

C

Explanation

Molecules which are transported across the membrane against their concentration gradient, i.e. from the lower to the higher concentration. Such a transport is called active transport, e.g., `Na^(+)`/`K^(+)` pump.