1 Several of the substances in lab are everyday kitchen item

1. Several of the substances in lab are everyday kitchen items. Would it have been useful to include soy sauce as one of the unknown substances for the assays?

2. You are given an unlabeled sample of goat milk and an unlabeled sample of soy milk. Which one of the assays that you performed in lab should you use to identify which sample is which? What should you use as a negative control and as a positive control for the assay?

Solution

Soy Milk will be a negative control as it does not have lactose in it, while as goat milk does have lactose in it which can be used to check if the bacteria given is lactose dependent or not.