Membrane Transport Mechanisms · USMLE Step 1

Which of these processes involves vesicle formation to transport large molecules or particles into the cell?

  1. Primary active transport
  2. Facilitated diffusion
  3. Endocytosis
  4. Osmosis
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Correct answer: Endocytosis

Endocytosis is the process by which cells engulf extracellular material (large molecules, particles, fluid) by forming a vesicle from the membrane — an energy-dependent form of transport distinct from diffusion or carrier-mediated processes.

Difficulty: Medium Question 11 of 24

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