Question

pumps move substances from areas of low concentration to areas of high concentration.
pumps always move substances out of the cell.
pumps always move substances into the cell.

Explanation:

To determine the correct statement about pumps (like membrane pumps in cells), we analyze each option:

• "Pumps move substances from areas of low concentration to areas of high concentration": This is true for active transport pumps, which use energy to move solutes against their concentration gradient (from low to high).
• "Pumps always move substances out of the cell": False—pumps can move substances into the cell (e.g., sodium - potassium pump moves K⁺ into cells) or out (moves Na⁺ out).
• "Pumps always move substances into the cell": False—pumps have bidirectional roles depending on the substance and cell needs.

Answer:

The correct option is: Pumps move substances from areas of low concentration to areas of high concentration.