Edexcel 'AS' and 'A' level Biology B core practicals suitable for use with a colorimeter.

Practical 1

Investigate a factor affecting the initial rate of an enzyme controlled reaction.
There are plenty of suggested practicals with enzymes here. Our favourite, because it is simple, reliable, inexpensive and safe, uses dopa oxidase.

Practical 5

Investigate the effect of temperature on beetroot membrane permeability.

Practical 10

Investigate the effects of different wavelengths of light on the rate of photosynthesis.