Hi, Ive got a practical assessment coming up and Im having trouble understamding the pracs we did in class, let alone doing them with the theory component. So far the pracs we did in class that i dont understand are:
- using liver and hydrogen peroxide to investigate substrate concentration of enzymes)
- using liver and filter paper to investigate pH change on enzymes
- looking into a microscope to measure diameter of red blood cells
(Im really confused with this one, it involves maths and micrometers and I just cant seem to understand it)

Im really bad with pracs and this time i dont even know if i can get the theory component right and i think their will be graphs so any tips will be soooo appreciated as i cannot even construct a graph properly, or interpret one. Please reply if you can help at all.............