Cell structure: nucleus, nucleolus and nuclear envelope

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  • Cell structure: Nucleus, Nucleolus and Nuclear Envelope
    • Nucleus
      • Cells without a nucleus include: Red blood cells and phloem sieve tubes
      • Largest cell organelle
        • Contains chromosones forming a tangle known as CHROMATIN
          • Chromatin are often dark-stained
        • DNA in lighter-staining parts of chromatin can be used for transcription
          • Transcription is the first stage of protein synthesis
    • Nucleus surrounded by a pair of membranes
      • Nuclear envelope
        • There are small gapes which are the nuclear pores
    • Nucleolus
      • Contains DNA that is being used to make ribosomes
        • Ribsomes are tiny organelles where protein synthesis takes place.
  • Transcription
    • the information on DNA is copied onto molecules of mRNA
      • these then travel out of the nucleus  through nuclear pores


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