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differentiating e^x gives e^x (need to know this), differentiating -5x gives -5 (step the power of the x down by 1 and multiply the original power with the coefficient, power of the x ...

The most importance driving factor in your answer should be your argument, At the beginning of the essay, make it clear to the marker exactly what you think about the issue in the question. For example, i...

A stimulus at the receptor end of the neuron causes the membrane to become more permeable to Na+ ions. Because there is a higher concentration of Na+ on the outside of the cell the flood into the cell dow...

Two populations become separated by a barrier such as sea (geographical separation). As a result populations cannot interbreed, hence gene flow between two populations is prevented. As a consequence, only...

• Create a revision timetable. It doesn't have to be to the hour, but make sure to write down all the topics you need to cover. For example, during my A-levels I'd do one mini topic e...