Active Transport

Review Questions

Active transport must function continuously because __________.

  1. plasma membranes wear out
  2. not all membranes are amphiphilic
  3. facilitated transport opposes active transport
  4. diffusion is constantly moving solutes in opposite directions

Hint:

D

How does the sodium-potassium pump make the interior of the cell negatively charged?

  1. by expelling anions
  2. by pulling in anions
  3. by expelling more cations than are taken in
  4. by taking in and expelling an equal number of cations

Hint:

C

What is the combination of an electrical gradient and a concentration gradient called?

  1. potential gradient
  2. electrical potential
  3. concentration potential
  4. electrochemical gradient

Hint:

D