How do you know your bacterium produces hydrogen sulfide

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Question: Why are catalase and oxidase tests important when attempting to identify a Gram negative rod-shaped bacterium? 2. What are the three sugars and their concentrations in TSI medium? 3. How do you know your bacterium produces hydrogen sulfide gas after being inoculated into a TSI slant? 4. Why do you add Kovac's reagent to a MIO tube? 5. Why does a MIO tube have to turn yellow first and then purple to be considered positive for ODC? 6. Why do you have to use two tubes when determining MRVP reactions? 7. Why do you have to use 40% KOH as part of a VP test? 8. What two enzymes allow a bacterium to use citrate as a sole source of carbon? 9. Name a bacterium that is urease positive (not a question, I know). 10. Why is MacConkey a selective and differential medium?

Reference no: EM133596025

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