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Tsar Alexander II of Russia signed the declaration abolishing serfdom in 1861 for a number of reasons, all of which combined to create a situation in which the system of serfdom became untenable in Russia...

The working memory model is a framework put forward by Alan Baddeley to describe how human's store and manipulate information they are currently working with. In it's original form it outlined an executiv...

Use key words and ensure you are specific in what you are saying. Try and avoid writing in long sentences, use bullet points if you can. Diagrams are also helpful for the examiner to understand your answe...

Nucleotides make up DNA. Nucleotides themselves are made up of a phosphate, sugar and base.

They bases are: Adenine (A), Thymine (T), Cytosine (C), Guanosine (G). 

A is bonded to T. C is bon...

dy/dx = (dy/du)(1/x), d^2(y)/dx^2 = (d^2(y)/du^2)(1/(x^2)) - (dy/du)*(1/(x^2))   

(x^2)( (d^2(y)/du^2)(1/(x^2)) - (dy/du)(1/(x^2)) ) + x(dy/du)*(1/x) + y = 0