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Nucleus
Nucleus
  • Nuclear envelope with pores (double-membrane)
  • Site of DNA replication and RNA synthesis (transcription)
  • Contains: chromatin, nucleolus (rRNA and ribosomal proteins)
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Nucleus

    * The nuclear envelope is a discontinuous double-membrane.
  • The gaps in the envelope are called nuclear pores.
  • The nucleus lies within the nuclear envelope
    • It is the largest organelle in eukaryotic cells (approximately five micrometers in diameter and visible under a light microscope).
    • The nucleus is the site of DNA replication and RNA synthesis (transcription).
  • Chromatin, the uncondensed form of DNA, resides in the nucleus
  • A nucleolus – nuclei can contain one or more of these nonmembranous organelles; cells that produce a large amount of proteins have a proportionally large nucleolus (and a large number of ribosomes).
  • rRNA resides within the nucleolus where it is synthesized; ribosomal proteins assemble in the nucleolus before maturing in the cytoplasm.

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