Plasma Membrane: Models and Transport · Zoology

Which transport mechanism shows specificity and saturation?

  1. Simple diffusion
  2. Osmotic movement
  3. Carrier-mediated diffusion
  4. Bulk-phase transport
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Correct answer: Carrier-mediated diffusion

Carrier-mediated (facilitated) diffusion uses specific carrier or channel proteins that bind particular molecules. Because of limited protein availability, it shows both specificity and saturation kinetics.

Difficulty: Medium Question 15 of 19

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