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A2 Biology Coursework Aim To find out how different sugar concentrations affect the respiration of yeast, I shall do this by conducting a simple safe experiment, which will involve the timing of the yeasts respiration, when mixed with different sugar concentration solutions. Introduction Yeast is single celled specie of fungi and is commonly used to make bread. Yeasts are commonly found wherever sugar occurs. It has been used for thousands of years to ferment sugar into ethanol i.e. alcohol. Yeast added to dough ferments the sugar in the dough to produce carbon dioxide. Also yeast is a heterotroph as it needs to consume a ready made supply of carbon. Yeast contains an enzyme called zymase, which will only bind with glucose molecules. During fermentation, it breaks down hydrolyses starch into complex sugars, then simple sugars, and finally ethanol and carbon dioxide. Respiration is a process that takes place in all living...

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