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Biology Investigation : Yeast-Alginate Plan: I plan to investigate the rate at which the enzyme catalase (found in yeast) breaks down hydrogen peroxide into water and oxygen. There are many factors I could vary in this experiment but I have chosen to vary the concentration of the hydrogen peroxide. I will make beads of yeast alginate by mixing 5cm3 of yeast (which contains catalase) and 5cm3 of alginate and stir thoughly with a glass rod. I will allow drops of yeast alginate to fall off the end of the glass rod into a small beaker of calcium chloride. I will make 50 beads and pick out 24 which are 5mm in diameter with forceps (I will measure them using graph paper). I will then drop a yeast bead into the substrate (hydrogen peroxide) where it will react. The yeast alginate bead will fall through the hydrogen peroxide (20cm3)...

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