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The nucleolus is the site where

  • A.ribosomal RNA is made and ribosomes assembled
  • B.messenger RNA is spliced before it is exported
  • C.the cell's DNA is replicated before division
  • D.the nuclear envelope itself is manufactured

Answer: A

It forms around the clusters of genes encoding ribosomal RNA and is not bounded by any membrane of its own. Its size reflects how heavily a cell is making ribosomes. Cells growing rapidly show conspicuously large nucleoli under the microscope.

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