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Discussion

Material passes between nucleus and cytoplasm through

  • A.channels in the nuclear lamina
  • B.nuclear pore complexes
  • C.gaps between the two membranes
  • D.vesicles budding from the envelope

Answer: B

Each pore is a large assembly of proteins that spans both membranes and controls what crosses. Small molecules diffuse through freely while large cargo requires a signal and a carrier. The cut-off lies around forty kilodaltons for unaided passage.

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