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First, when faced with a question like this you must factorise the expression. So we need to factorise x 2 -5x+4 into 2 linear parts. (Linear terms are terms without any powers of x). To do this, we need to ...

A cell surface membrane is made up of a type of molecules called phospholipids , so what is a phospholipid bilayer ? The first step would be to break down the term. ‘ Phospho ’ means that the molecule(s) mus...

Expanding - or geting rid of brackets. Make sure you multiply everything by everything! Correct: p 2 +2p -5p -10 = p 2 -3p -10 Wrong: p 2 + 2p -5 ...forgot that the -5 also needs to be multiplied by (p+2) Wr...

Transcription takes place in the nucleus and is the first stage of protein synthesis. RNA polymerase attaches to the DNA double helix at the promoter sequence and unwinds the helix by breaking the hydrogen b...

The idea of writing an analytical essay in French can seem daunting at first but it is important to feel confident, as the long essay questions can make up a considerable percentage of the marks in an A-Leve...