Use of microorganisms in food production
Bacteria is used to make yoghurt! Milk is heated with milk protein and sugar Heat kills bacteria Different bacteria added Bacteria ingest sugar (lactose) and ferment it into lactic acid (pH 4-5) Acid makes the milk thick and sour (it curdles) http://www.bbc.co.uk/learningzone/clips/how-yoghurt-is-made/12208.html
Bacteria is used to make cheese! Milk is heated Bacteria is added and ingest sugar (lactose) and ferment it into lactic acid (pH 4-5) Acid splits milk into curds and whey Rennet added to help curds solidify – cheese! http://www.bbc.co.uk/learningzone/clips/how-processed-cheese-is-produced/9215.html