Cell structure: nucleus, nucleolus and nuclear envelope
- Created by: Molly Webb
- Created on: 30-03-15 09:31
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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
- Contains chromosones forming a tangle known as CHROMATIN
- Nucleus surrounded by a pair of membranes
- Nuclear envelope
- There are small gapes which are the nuclear pores
- Nuclear envelope
- Nucleolus
- Contains DNA that is being used to make ribosomes
- Ribsomes are tiny organelles where protein synthesis takes place.
- Contains DNA that is being used to make ribosomes
- Nucleus
- Transcription
- the information on DNA is copied onto molecules of mRNA
- these then travel out of the nucleus through nuclear pores
- the information on DNA is copied onto molecules of mRNA
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