describe any changes that you can see in the milk
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the change of milk into curd is both a physical and chemical change. Physical change; as the milk turns into curd and forms a mass as the milk solid make a cluster. And Chemical change; as the lactose in the milk turns into lactic acid, and as acid increases the coagulation takes place.
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A perfect example is the conversion of milk to curd or yogurt.
Milk is inoculated with lactic acid bacteria. They convert milk sugar lactose into lactic acid. Lactic acid acts on globular milk protein casein, causes its denaturation and conversion to fibrous state. The protein fibres form a reticulum which holds milk fat: This changes milk into Curd or yoghurt.
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