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There are 2 sounds heard by a stethoscope, the so called 'lub dub'. The lub being the closing of the atrioventricular valves (i.e. the valves between the atria and the ventricles). This is caused by an in...
First, when faced with a question like this you must factorise the expression. So we need to factorise x2-5x+4 into 2 linear parts. (Linear terms are terms without any powers of x). To do this,...
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. ‘Phosph...
Expanding - or geting rid of brackets. Make sure you multiply everything by everything! Correct: p2 +2p -5p -10 = p2 -3p -10 Wrong: p2 + 2p -5 ...forgot that the -5 al...
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 hydroge...
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