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Constitutive secretion differs from regulated secretion in that constitutive secretion

  • A.proceeds continuously without a signal
  • B.occurs only in response to a stimulus
  • C.requires no vesicles to be formed
  • D.delivers material into the nucleus

Answer: A

Vesicles fuse with the plasma membrane as they arrive, which supplies the membrane and matrix components a cell needs steadily. Regulated secretion holds vesicles in reserve until a signal arrives, as it does for insulin.

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