| In making yoghurt, what bacterial waste product converts milk into the semi-solid yoghurt? | | |
| Why must milk be sterilised before adding the lactobacillus bacteria? | | |
| Why must yoghurt be kept cool in the fridge once bought? | | |
| What is the name of the sugar in milk that the bacteria break down? | | |
| What is the name of the soluble protein in the milk? | | |