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(1) Cell membranes (plasma membranes) help organisms maintain__________ homeostasis by controlling what substances may enter or leave cells. (2) Some substances can cross a cell membrane through passive transport, while other substances can only cross a cell membrane through active transport. What is the difference between active and passive cellular transport?

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Answer:

Explanation:

Active cellular transport:

  • It is the movement of molecules against the concentration gradient  (from low concentration to high).
  • Active transport requires expense of energy supplied by ATP.
  • It is a rapid way to transport of large sized molecules.

Passive cellular transport:

  • It is the movement of molecules along the concentration gradient (from high concentration to low).
  • Passive transport does not require expense of energy.
  • It is a slow process and small sized molecules get transprorted.

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