Plasma Membrane: Models and Transport · Zoology

Endocytosis is best defined as:

  1. Movement of molecules through membrane channels
  2. Transport of substances against a concentration gradient
  3. Uptake of material via membrane invagination
  4. Release of substances to the outside of the cell
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Correct answer: Uptake of material via membrane invagination

Endocytosis involves the inward folding of the plasma membrane to form vesicles that bring materials into the cell. It is an energy-dependent process used for nutrient uptake and receptor internalization.

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