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Enzymes are proteins that catalyse specific biological reactions in the body. These proteins have a specific 3D structure known as a teritary structure, with a specialised domain known as an 'active site'...

A nerve impulse travelling down a motor neurone causes the release of acetylcholine from the synpatic knob into the synaptic cleft. This then diffuses across the synaptic cleft down its concentration grad...

In order to understand a source and write the best possible answer, there are seven easy steps to take: 

1. What does the source say? We need to briefly look at the source to und...

The use of prepositions to say you are 'in' a country is actually quite simple in French. Your two options are 'en'  (which is more common) and 'au'.

'Au' is used with masc...