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A differentiated cell in a multicellular organism owes its character to

  • A.the number of chromosomes it carries
  • B.the size of its plasma membrane
  • C.which of its genes are expressed
  • D.which genes it has physically retained

Answer: C

The genome is common to nearly all the cells, so identity comes from patterns of expression that are established during development and then maintained. This is why a differentiated nucleus can sometimes be reprogrammed.

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