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Mitosis is the seperation of DNA. There are 4 stages of mitosis that you need to be aware of for A level Biology: Prophase, Metahase, Anaphase and Telophase. (I like to remember this order as P.Mat)

46 chromosomes - all cells which undergo mitosis should maintain chromosome number

This question is asking you to explain how action potentials travel across neuromuscular junctions and how the closure of calcium ion channels would prevent the signal travelling across the junction, so w...