A variable is any value that does/might change during an experiment. Variables can include things like pH, temperature, colour, or the concentration of substances. The amount of time that has passed is a variable, as are rates of reaction.

Can you spot the problems with these A level Biology exam question answers? These bloopers come up a lot - check you’re not going to make the same mistakes.

How to change the language you use in A level Biology Answers, and get better grades

OCR A June 2019 summer highlights

There is plenty of excellent guidance on how to plot graphs and draw tables in the OCR practical booklet  ..... pdf

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Surprisingly popular Photosynthesis revision

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Enzymes have an active site - Substrates don't.

The substrate is a complementary shape to the active site NOT the "same shape"

Enzymes reduce the activation energy for a reaction to occur

Anabolism is making, Catabolism is breaking

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Teaching aerobic respiration is a difficult topic, traditionally,  teachers begin with glycolysis, then link reaction and krebs cycle and then the electron transport chain, I would argue that there is a better way to teach this.

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10 Basic points to remember for Biological Molecules

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How to understand the Cardiac Cycle

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