Question

What is correct about the movement of substance across the membrane in facilitated diffusion?

• A. It is an active transport.
• B. It doesn't cause transport of molecules from lower concentration to higher
• C. it does not require a carrier protein
• D. It works against concentration gradient

Answer 1

The correct option is B It doesn't cause transport of molecules from lower concentration to higher

In facilitated diffusion, special proteins help move substances across membranes along the concentration gradient without expenditure of ATP energy. Facilitated diffusion is very specific, it allows cell to select substances for uptake. It is sensitive to inhibitors which react with protein side chains.