Cell structure and organelles

Nucleolus

  • rRNAs produced and assembled into ribosomes
  • Nucleolus is NOT membrane bound
  • Aggregate of macromolecules:
    1. rRNA genes
    2. Ribosomal protein subunits
    3. Partly assembled ribosomes
  • rRNA genes also involved in formation of nucleolus
  • Nucleolus size depends on number of ribosomes it produces

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