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microbiology: pure culture and mixed culture examined

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1- Explain why it is very important to have a pure culture and not a mixed culture when performing biochemical tests.

2- Explain how culturing an organism on several different types of media can help identify an organism in a relatively short period of time.

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Solution Summary

This solution explains why it is important to have a pure culture when performing biochemical tests. Additionally, this solution explains how culturing an organism on a variety of media can be used to more quickly identify the microbe.

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1. Having a mixed culture when performing biochemical tests may lead to inaccurate results. For example, if an oxidase-negative culture is contaminated with oxidase-positive microbes, the biochemical test would indicate that the sample is oxidase positive. This would lead to difficulties in identifying the infective agent. This could occur ...

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