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Summary Cell cycle Year 1 AQA A level biology
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Year 1 Biology AQA A level notes. Achieved an A* in my final exam using these notes. They are based on the mark scheme requirements.
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Cell cycle summary notes03 October 2022 18:21
- 3 stages of cell cycle- interphase, mitosis and cytokinesis
Interphase - absence of chromosomes
1. G1- first growth phase
- Cells increase in size as new proteins and organelles are synthesised
- Cells are differentiated to make specific proteins
- Transcription takes place on nucleus, translation on rough endoplasmic reticulum
- Lots of aerobic respiration- normal metabolic roles occur
- Rate of completion of G1 can vary
- Longest stage
Examples: skin cells and hair follicles go through it quickly as they are constantly being she
process slowly. Nerve cells finish the cell cycle at this stage
2. S - synthesis phase
- Semi conservative replication - DNA replicated
3. G2- second growth phase
- Organelles grow and divide
- Preparation for mitosis
Mitosis - PMAT
Prophase
- Chromatin shortens and condenses to form chromosomes - DNA wraps itself around th
chromosomes
- Chromosomes start to become visible
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