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Diffusion is a passive process that involves the movement of ions from an area of high concentration to an area of low concentration through a semi permeable membrane until an equilibrium has been reached...

For this question, you are required - according to the mark scheme - to give two separate factors that explain why Stalin became leader, demonstrating specific subject knowledge for each factor. The two f...

There are a few ways of solving these simultaneous equations, but most of them involve substitution. Perhaps the most intuitive substitution to make is the second equation (y=3x+5) into the first one (xy=...

The above sample question was taken from the 2018 GCSE Maths Higher paper.First we simplify the numerator, 3x^2 - 8x - 3, which is a quadratic written in the form ax^2 + bx + c so we can simplify it by fa...

Transcription is the first step of protein synthesis and occurs within the nucleus of the cell. Within the cell's nucleus is the DNA. Firstly an enzyme called DNA Helicase 'unzips' the two DNA strands sep...