A correct distinction between facilitated diffusion and active transport of a su

Question

A correct distinction between facilitated diffusion and active transport of a substance across a biological membrane is that . . .

A. active transport requires conformational changes in the transport protein associated with the transport process, and facillitated diffusion does not.

B. active transport requires integral membrane protein to carry out the transport, and facillitated diffusion does not.

C. facilitated diffusion depends on an existing energy gradient acting on the transported substance, while active transport makes such a gradient.

D. facilitated diffusion requires a protein lined pore in the membrane, and active transport does not.

E. facilitated diffusion requires energy from ATP hyrdolysis, but active transport does not.

Explanation / Answer

The correct option is C. facilitated diffusion depends on an existing energy gradient acting on the transported substance, while active transport makes such a gradient.

Facilitated diffusion process depends on an existing energy gradient. This process does not directly involve energy in the form of ATP or GTP. Therefore, the molecules move along their concentration gradient.

Particles move against the concentration gradient in the process of active transport. Therefore, this process requires an input of energy in the form of ATP from the cell.

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