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State and explain the principles of the Polymerase Chain Reaction (PCR)

Firstly, PCR is used to amplify DNA so that it can be used in analysis. It is particularly useful in processes like forensic science to identify DNA samples left behind at a crime scene. The process begins w...
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‘Shakespeare presents surveillance and spying to be integral to a functioning court in Denmark.’ Explore the theme of surveillance and spying in 'Hamlet'. (45)

Intro - First thing to do in your introduction is alert the reader to what your line of argument (LOA) will be, and then how you will evidence this (AO1). Always make it clear what your conclusion will be ev...
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‘An eighteenth-century process is still used for the election of a twenty-first-century president.’ Critically evaluate this view of the US’ Electoral College (30 marks).

The use of ‘critically evaluate’ shows that students must address and analyse arguments both for and against the use of the Electoral College (EC). However, to achieve the top marks students must convincingl...
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Let f(x) = x^3 -2x^2-29x-42. a)Show (x+2) is a factor b)Factorise f(x) completely

a) To show (x+2) is a factor, we want to show f(-2)=0. So (-2)^3-2(-2)^2 -29(-2)-42=-8-8+58-42=0 b) Divide x^3 -2x^2-29x-42 by x+2 to get x^2-4x-21 which we factorise to get (x+3)(x-7). Hence f(x)=(x+2)(x+3)...
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Describe The Structures of different sugars, and why these different features are useful.

Amylose is a short coiled molecule. Which makes it compact, Good for storing lots of glucose in a small space.Amylopectin is a branched molecule with many end points for enzymes to access. So lots of hydroly...
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