CAIE A Level Biology 9700 · The mitotic cell cycle
During mitosis, the behaviour of the nuclear envelope and the spindle apparatus changes in a coordinated way. Describe the changes to the nuclear envelope and the spindle that occur during prophase, and explain why these changes are essential for the successful completion of mitosis.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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