Question

Consider the following statements and choose the correct statements.
I. Carrier proteins are needed by both facilitated diffusion and active transport and are sensitive to inhibitors that react with protein's 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 in active transport.
V. Transport rate reaches to saturation point, when all the active proteins are used.
Choose the correct option.

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

Answer 1

Answer: (D)

Statements I, II, III and V are correct and statement IV is incorrect. It can be corrected as
In active transport, energy is required to pump molecule against a concentration gradient.