Which one of the following is the site for active ribosomal $RNA$ synthesis?

  • A
    $(1)$ Nucleolus
  • B
    $(2)$ Kinetochore
  • C
    $(3)$ Centrosome
  • D
    $(4)$ Chromatin

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$S -$ Assertion: Individual chromosomes are not identifiable during interphase.
$R -$ Reason: They exist as highly extended and elaborate nucleoprotein fibers called chromatin.

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Which of the following is true for nucleolus?

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