Quality Control Is Set Up on a New Lot of an Indole

question 9

Multiple Choice

Quality control is set up on a new lot of an indole reagent.Clostridium bifermentans and Clostridium bolteae are used,and the following results are obtained:
· C) bifermentans: positive
· C) bolteae: negative
Which one of the following statements explains this discrepancy?

• A)The reagent is most likely expired.
• B)The incubation time is most likely abbreviated.
• C)These two organisms are poor choices;both are indole-positive.
• D)No discrepancy is present.The results obtained are correct.

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