Nucleus: The nucleus is the single organelle of the cell that contains the cellular DNA. The nucleus is usually rounded or elongated and located in the centre of the cell.

Diameter: 4- 10 µm.

Shape: Rounded or elongated.

Location: Usually in the centre of the cell.

Structures found in the nucleus: are


  • Nuclear membrane.
  • Chromatin.
  • Nucleolus.
  • Nucleopalsm.


  • Cellular regulation: Houses genetic material, which directs all cellular activities and regulates cellular structure.
  • Production: Produces ribosomal subunits in nucleous and exports them into cytoplasm for assembly into ribosomes.

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