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1) Is a catalase test performed on colonies from a BAP? State reasons to support your answer?

2) describe how a catalase test helps in distinguish between Staphylococcus from Streptococcus sp.

3) List five gram negative bacilli which are oxidize positive and state a limitation for this test.

4) What common gram positive organisms are positive from the PYR test?

5) Describe the principle of the indole test method.

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