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Yeast substrates

Investigation of the rate of activity of catalase between 20 and 60o C.

A more controlled version of the infamous elephant's toothpaste demo, showing effect of varying pH on the rate of activity of catalase from yeast.

CAL Curry

Shows you how to plot a simple graph of temperature and rate of reaction, and how to add axis titles, units and gridlines.

Shows digestion of gelatin on photographic film by trypsin at a range of pH's.

A "classic" practical looking at osmosis in living tissue. Covers effect of different glucose solutions on mass and length of potato chips, and explains how to calculate percentage change.

Early Saturday morning voiceover sounds a bit rough on this one...

Don't judge us for the video quality - we're getting better...!

This video makes a lot more sense if you've seen our first video on diffusion and surface area.

Diffusion 1 : Surface area and volume IGCSE Biology

Four food tests on a biscuit. We deliberately don't say what the results mean - watch our other food test videos first!

Kidney dissection GCSE/A Level Biology

Starch and Amylase IGCSE Biology

Lipid emulsion test IGCSE Biology

Biuret test IGCSE Biology

Burning foods practical IGCSE Biology

Benedicts Test IGCSE Biology

Iodine test for starch IGCSE Biology

Bi3S4 Sampling with quadrats

Drawing a Line Graph in Biology