Multiple choice

Which is an example of an active transport process?

  1. carrier proteins to move ions with concentration gradient

  2. the sodium-potassium pump

  3. the movement of water into and out of the cell

  4. diffusion through ion channels
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sodium-potassium pump requires energy (ATP) to move ions against their concentration gradients. The other options describe passive processes that move molecules with the gradient.

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