In the intestine,Na⁺ and an amino acid bind to the same transport protein that moves the two substances in the same direction.This is an example of A) passive transport. B) simple diffusion. C) secondary active transport. D) facilitated diffusion. E) simple secondary diffusion.

Question

Quizplus · Accepted Answer

This is an example of secondary active transport because the movement of Na⁺ and the amino acid is coupled with the movement of another molecule (in this case, sodium ions) against their concentration gradient, which requires the use of energy. This is not passive transport, simple diffusion, or facilitated diffusion, as those modes of transport do not involve the use of energy or coupling with another molecule. There is no such thing as "simple secondary diffusion."

In the Intestine,Na+ and an Amino Acid Bind to the Same

In the Intestine,Na⁺ and an Amino Acid Bind to the Same