What are three differences and two similarities between active and passive transport?  

Active and passive transport are similar in that they both transport ions, using ion channels to move ions across the cell membrane. Active and passive transport are different in that active transportation requires energy, moves molecules against the concentration gradient, and may require an ion pump, while passive transport does not.

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Differences

Passive transport doesn't require energy (ATP), active transport does require energy.

Passive transport moves molecules WITH the concentration gradient (high to low), while active transport moves molecules AGAINST the concentration gradient (Low to High).

Similarities

They both allow the cell to maintain homeostasis by maintaining an equilibrium of subtances in and out of the cell.

They both involve moving material across or through the plasma membrane. 

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Similarities:

Both involve ion movement. Both use ion channels to move ions across the cell membrane, in or out of the cell.

Differences:

Passive Transport (or Diffusion) moves ions from high concentration to low, using no metabolic energy. Active Transport moves ions from low concentration to high, using metabolic energy in the form of ATP.  Active Transport uses an ion pump (or Sodium/Potassium pump) to move 3 sodium ions out of the cell and 2 potassium ions in to the cell through the energy of 1 ATP molecule.

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