Question

Consider the following statements and choose the correct answer.

I. Carrier proteins are needed by both facilitated diffusion and active transport and are sensitive to inhibitors that react with protein side chain.

II. Different types of proteins present in the membrane play a major role in both active as well as passive transport.

III. The carrier proteins needed by facilitated and active transport are specific.

IV. There is no need of energy to pump molecule against a concentration gradient in active transport.

V. Transport rate reaches to saturation point, when all the active proteins are used.

• A. I, II, III, IV and V
• B. I, II and III
• C. V, IV and I
• D. I, II, III and V.

Answer 1

The correct option is D

I, II, III and V.

Energy is required for the transport by the carrier proteins.