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1. Some types e.g. macrophages can engulf and digest pathogens, killing them
   2) Produce antibodies which recognise and target specific pathogens, thus preventing secondary infection
   3) Produc...

Introductions are the most important parts of essays at A-level. While knowing your content is important, the way that you structure essays is the most crucial thing you can learn to make sure that you a...

mRNA is a molecule produced in the process of transcription, the first stage of protein synthesis from a DNA molecule. First, DNA Helicase, an enzyme, is used to break the hydrogen bonds holding the doubl...

Price discrimination occurs when a firm, with monopoly power, charges different prices to different people for the same product, due to reasons other than cost difference. It relies on various conditions ...

When answering an essay question, it is important to note exactly what the question is asking. Here "How far do you agree...?". Therefore, throughout writing the essay, the focus must be on this...