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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       

As branching increases the boiling point decreases because there are fewer points of contact. This also means van der Waals forces are weaker in branch chained isomers and thus less energy is required to ...

Cell division occurs through a process called mitosis where a mother cell splits in two to form daughter cells identical to that of the mother. The stages of mitosis are prophase, metaphase, anaphase, tel...