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Biology Assessed Practical 2002 How does varying the concentration Rennin affect the coagulation time of Milk? Scientific Knowledge Enzymes Enzymes are large molecules, which are protein in nature. They are biological catalysts that speed up chemical reactions in the body. They operate by a "lock and key" method. The Enzyme has a certain "lock" (active site) that only a specified substrates "key" will fit into. Rennin A proteolytic enzyme that speeds up the coagulation of milk. It is usually found in the tissues of a calves fourth stomach. Its purpose is to coagulate the milk in young animals so that the proteins have time to be extracted, rather than flowing straight through the digestive system. This particular enzyme catalyses the conversion of the protein in milk (caseinogen) into paracasein. This forms a thick curd in the stomach meaning the milk can be exposed to Rennin for a greater period of time. Milk Milk is an...

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