Anatomy & Physiology › Section C · The cellular level › Topic C.3
The nucleus and DNA replication
Almost every cell in your body carries the same two metres of DNA, folded into a nucleus a few thousandths of a millimetre across. Before a cell divides it must copy all of it, billions of letters, with only a handful of mistakes.
In this topic
- The nucleus and its exceptions
- Envelope, pores and nucleolus
- Chromatin and chromosomes
- The double helix in brief
- Worked example: writing the partner strand
- Copying before dividing
- Building the new strands
- Proofreading and repair
- Worked example: how many errors per division?
- Telomeres and the ends of chromosomes
- Common mistakes to avoid
- Key takeaways
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