# Lab Questions at End (picture 3) QUESTIONS This week in lab you will learn an important...

###### Question:

Lab Questions at End (picture 3)
QUESTIONS
This week in lab you will learn an important technique that microbiologists use to isolate one bacterial species from the population of other microbes it was living with in the natural environment. In most environments there are mixed populations of bacteria. For instance, 600 different types of bacteria have been isolated and identified in the mouths of humans. In soil or water there are also many types of bacteria present. In order to perform tests on a microbe of interest, it must first be isolated. Then, procedures which will lead to an identification of the microbe can be performed. This would include staining, biochemical tests, or genetic tests. Other reasons microbes need to be isolated are for research purposes, or genetic engineering. The most commonly used technique to isolate one bacterium from another is the streak plate technique. The goal of a streak plate is to start with a large density of bacteria, and thin them out so that you end up with single bacterial cells. As these single cells divide, it forms isolated colonies which you can describe and may help identify what type of bacteria you are working with. 0

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