Answer to Question #24428 in Molecular Biology for Mordy Grubin
The signs of chemical change when milk turns sour are formation of a solid precipitate which is when it becomes hard. Gas bubbles are released as it spoils which is the odor as well.As for sour milk, bacterial action on milk produces lactic acid, which ruins the taste of fresh milk. This indeed is a chemical reaction.Lactic acid bacteria ferments the lactose in the milk turning it to lactic acid.
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