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Explain the sequence of events that occur in the control of the cardiac cycle.

The sino-atrial node depolarises which causes a wave of excitation to pass through the atria (right prior to left) before reaching the atrio-ventricular node. The wave of excitation causes systole of the atr...
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Answered by Hannah G. • Biology tutor
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Calculate the percentage of Copper in Copper oxide (CuO, Mr=80). (3 marks)

Ar of Cu = 64 (1 mark) Percentage of copper in CuO = 64/80 x100 (1 Mark) Percentage of copper in CuO = 80% (1 mark)
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Answered by Katie D. • Chemistry tutor
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What is the difference between haploid and diploid cells? (2 Marks)

Diploid cells contain 2 sets of chromosomes (23 pairs of chromosomes) e.g. body cells . Haploid cells contain half the amount of chromosomes as diploid cells (only 1 set of chromosomes ) e.g. gametes.
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Answered by Katie D. • Biology tutor
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Describe how a sperm cell is adapted to its role (4 marks).

The role of a sperm cell is to fertilise an egg cell and pass on genetic material. The nucleus of the sperm cell contains the male genetic material/DNA. The head of the sperm cell contains many mitochondria ...
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Answered by Katie D. • Biology tutor
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How can I make my personal statement stand out?

As well as the typical answers to this: 'say what you love about the subject', 'make sure your personality comes across' etc, the main way in which I believe a personal statement stands out is by demonstrati...
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