Question

Symport:

a. involves proteins called exchangers.
b. is the process used by Na+/K+ ATPase.
c. is used to move Na+ and glucose into the epithelial cells of the intestine.
d. maintains proper pH by coupling movement of Na+ and H+ ions.
e. moves two transported molecules in opposite directions.

Answer 1

Symporters are secondary active transporters that move two substances in the same direction, such as the sodium-glucose symporter that uses sodium ions to transport glucose molecules into the cell against their concentration gradient.

Step-by-step explanation:

Symporters are secondary active transporters that move two substances in the same direction. For example, the sodium-glucose symporter uses sodium ions to "pull" glucose molecules into the cell. Because cells store glucose for energy, glucose is typically at a higher concentration inside of the cell than outside. However, due to the action of the sodium-potassium pump, sodium ions will easily diffuse into the cell when the symporter is opened. The flood of sodium ions through the symporter provides the energy that allows glucose to move through the symporter and into the cell, against its concentration gradient.