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How should I structure a good essay?

There area couple of key points to consider when structuring an A level English Essay:Firstly and most importantly you need to very carefully plan your essay. You can spend up to 15 minutes under exam con...

Answered by Scarlett P. • English tutor

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Compare aerobic and anaerobic respiration in a human cell. 3 marks

3 marks, meaning 3 separate points and a minimum of 3 answers for full marks. 1 comparison mentioning each of the points is 1 mark. Use comparators e.g. less and more. Better to be safe than sorry!Compare...

Answered by Niamh M. • Biology tutor

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Explain how a reflex action occurs

Reflex actions are automatic responses to stimuli i.e. a change in an environment.A receptor first detects a stimulus such as heat, its function is to convert this stimuli energy in this case heat into an...

Answered by Arjun V. • Biology tutor

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Describe the differences in molecular structure between graphite and diamond, and use this to explain their differing properties.

Both graphite and diamond are made of carbon atoms. However, while the carbon atoms in diamond are bonded to four neighbouring atoms, the carbon atoms in graphite are only bonded to three other atoms. The...

Answered by Briony G. • Chemistry tutor

1953 Views

Meselson & Stahl grew E. coli cells in a dense N15 nitrogen medium, then transferred to a lighter N14 nitrogen medium. Describe the observations of their experiment (until the third generation) and use it to explain the mechanism of DNA replication.

Observations:- After each generation, the amount of DNA will be doubled during the S phase of interphase- At the start, all DNA will be labelled N¹⁵- In...

Answered by • Biology tutor

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