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The nuclear envelope consists of

  • A.two membranes separated by a narrow space
  • B.a single membrane like that of a lysosome
  • C.three membranes stacked closely together
  • D.a rigid wall of protein with no lipid

Answer: A

The outer membrane is continuous with the endoplasmic reticulum and carries ribosomes, while the inner one is lined by the lamina. The space between them is continuous with the lumen of the reticulum. The nucleus is therefore part of the endomembrane system rather than separate from it.

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