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IB Biology Higher Level 1.6 Summary Notes

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CELL BIOLOGY - I scored a Level 7 on my final exam using these notes. Introduction to cells - Ultrastructure of cells - Membrane structure - Membrane transport - The origin of cells - Cell division

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1.6 Revision notes
CELL DIVISION

Mitosis
Division of the nucleus into two genetically identical daughter cells

Stages in Mitosis: Pass Me A Taco
Prophase Metaphase Anaphase Telophase
Prophase
- Chromosomes become condensed (fatter and shorter) via supercoiling
- Nucleolus breaks down
- Centrosomes move to opposite poles
- Microtubules form from centrosomes
o Microtubules = spindle fibres
- Nuclear membrane/envelope breaks down and nucleus dissolves




Metaphase
- Microtubules continue to grow and attach to centromeres
o Centromere: centre point of a chromosome
- Microtubules depolymerisation causes contract in length
- Chromosomes align at centre of cell (equatorial plane)




Anaphase

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