BRAINCAKEThe Cell Cycle
Revision notes for The Cell Cycle in AQA Biology (7401). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- The Cell CycleCells undergo a regular cycle of growth and division.
- MitosisMitosis is important in growth, repair and asexual reproduction.
- ProphaseProphase: The nuclear envelope breaks down and the and the nucleolus disappears.
- MetaphaseMetaphase: By metaphase, chromosomes have reached the metaphase plate (or equator) in the middle of the cell.
- AnaphaseAnaphase: The centromeres split into two as the spindle fibres attached to the centromeres shorten.
- TelophaseTelophase: Once the chromosome reaches the pole they unwind and become loosely coiled chromatin.
- CytokinesisCytokinesis is the cell division that takes place after mitosis.
- The Importance of MitosisMitosis is used for growth, repair and asexual reproduction.
- Cancer and the Control of MitosisThere are about 200 types of cancer characerised by uncontrolled cell division.
- Treatment of CancerCancer is treated by killing the abnormal cells.
- Cell Division in Prokaryotic CellsIn prokaryotes the circular DNA attaches to the cell membrane and replicates.
- The Replication of VirusesViruses can only replicate by using the host cell apparatus as they are non-living.