Quality Control Is Performed to Test the Validity of Catalase

question 21

Multiple Choice

Quality control is performed to test the validity of catalase production at 68°C.M.fortuitum and M.tuberculosis are used,which yield a positive and negative reaction,respectively.Which one of the following statements explains this discrepancy?

• A)Both organisms were most likely incubated at the wrong temperature.
• B)Both organisms were most likely incubated on the wrong media before testing.
• C)The catalase reagent is most likely expired.
• D)No discrepancy is present.M.fortuitum is catalase-positive and M.tuberculosis is catalase-negative at 68°C.

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