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GCSE Assessed Practical Hypothesis Yeasts are large groups of unicellular fungi. They are found on the surfaces of fruits, vegetables and leaves. They break down glucose into Carbon Dioxide, Ethanol when releasing energy by anaerobic respiration (fermentation). Although yeast does respire anaerobic if there is oxygen available yeast will respire aerobically to gain more energy. This process doesn't release as much energy as aerobic respiration however. The energy released is used for production and reproduction of proteins. Yeasts reproduce asexually via budding, a process where a daughter cell is developed from an original. This process can be repeated many times and is the reason why yeasts can reproduce so quickly. Yeasts contain enzymes that de-nature at roughly 45 °C, as is the case with most organisms. The reaction when yeast respires anaerobically is: Glucose Ethanol + Carbon Dioxide + 1.17 kJ/g energy Prediction As the sugar concentration of the solution increases so will...

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