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The simplest biochemical test that is used to differentiate between Streptococcus and Staphylococcus species is the Catalase test. In this test we are testing for the ability of the bacteria to produce the enzyme catalase.
To identify different genera of Enterobacteriaceae, a microbiologist may run a series of tests in the lab. These include: Phenol red; Tryptone broth; Phenylalanine agar for detection of production of deaminase, which converts phenylalanine to phenylpyruvic acid; Methyl red or Voges-Proskauer tests depend on the digestion of glucose.