Nucleus: Difference between revisions
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Brief description of Nucleus structure and role within the Eukaryotic cell. |
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The Nucleus is the cell 'control centre' found in [[Eukaryotes]]. It is the source of the cell's DNA and RNA and is where [[Transcription|Transcription ]] takes place. | The Nucleus is the cell 'control centre' found in [[Eukaryotes]]. It is the source of the cell's [[DNA|DNA]] and [[RNA|RNA]] and is where [[Transcription|Transcription ]] takes place. | ||
It is comprised of: | It is comprised of: | ||
Revision as of 19:43, 25 November 2010
The Nucleus is the cell 'control centre' found in Eukaryotes. It is the source of the cell's DNA and RNA and is where Transcription takes place.
It is comprised of:
1) A Nuclear Envelope = twin membrane that protects contents from cytoplasm and macromolecules that could interfere with internal processes. Nuclear pores perforate the membrane and allow small molecules to diffuse freely in and out of the structure. Macromolecules (like nucleic acids) are moved into the nucleus via active transport.
2) Nucleoplasm = this material comprises mostly of Chromatin
3) Nucleolus = 'core' of Nucleus, relatively unstable structure without a membrane contains rRNA (ribosomal RNA) and is the site of Ribosome synthesis.