Question

Properties related to facilitated diffusion and active transport but not to simple diffusion, are
A. Require special membrane proteins
B. Highly selective
C. Saturation
D. Response to protein inhibitors

• A. A and B
• B. A and C
• C. A and C
• D. All of these

Answer 1

The correct option is D All of these

All of the options are correct. Both facilitated diffusion and active transport require specialised membrane proteins, which are highly selective about their substrates. They can be saturated by high concentrations of substrate, and are affected by inhibitors. Simple diffusion does not require a protein carrier, and so does not involve any of the other given characteristics.