Question

Which of the following process requires a transport protein for the movement of specific materials across a plasma membrane?

• A. Concentration gradient
• B. Active transport and Facilitated diffusion
• C. Osmosis
• D. Phagocytosis
• E. Facilitated diffusion

Answer 1

The correct option is B Active transport and Facilitated diffusion

Membrane transport protein is a membrane protein involved in the movement of ions, small molecules, or macro molecules, such as another protein, across a biological membrane:

Active transport is the movement of a substance across a membrane against its concentration gradient. This is usually to accumulate high concentrations of molecules that a cell needs.

Facilitated diffusion is the passage of molecules or ions across a biological membrane through specific transport proteins and requires no energy input. Facilitated diffusion is used especially in the case of large polar molecules and charged ions.

Hence answer is 'Active transport and Facilitated diffusion'