Inquiry into milk turning to yoghurt.

IB Biology: Inquiry into milk turning to yoghurt.

This lab is an introduction to the identification of controlled variables in the exploration section of an investigation. Good training for the IA. Students consider the chemical composition of milk, the affect of heating milk proteins and role of lactic acid bacteria in changing the pH of milk transforming it into yoghurt. A method of estimating the number and types of bacteria found in milk and yoghurt is used to carry...

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