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Questions and Answers
What does the catalase test determine?
What does the catalase test determine?
- The ability to hydrolyze urea
- The ability to produce urease enzyme
- The ability to degrade hydrogen peroxide (correct)
- The ability to produce hydrogen peroxide
Which of the following organisms are catalase positive?
Which of the following organisms are catalase positive?
- Escherichia coli
- Streptococci (correct)
- Enterococci
- Klebsiella pneumoniae
What is the outcome when catalase-positive organisms are exposed to hydrogen peroxide?
What is the outcome when catalase-positive organisms are exposed to hydrogen peroxide?
- Formation of a white precipitate
- Production of bubbles (correct)
- Color change of the agar
- No visible change
Why is the production of catalase considered an important virulence factor?
Why is the production of catalase considered an important virulence factor?
In the catalase test, what is the key difference between staphylococci and streptococci?
In the catalase test, what is the key difference between staphylococci and streptococci?
How does the catalase test help differentiate between gram-positive organisms?
How does the catalase test help differentiate between gram-positive organisms?
What is the purpose of the citrate test described in the text?
What is the purpose of the citrate test described in the text?
What enzyme is involved in breaking down citrate during the citrate utilization test?
What enzyme is involved in breaking down citrate during the citrate utilization test?
What color change indicates a positive result in the citrate test?
What color change indicates a positive result in the citrate test?
Which organism is given as an example for testing positive in the citrate test?
Which organism is given as an example for testing positive in the citrate test?
How long does it take for a color change to deep blue or purple to occur in the oxidase test?
How long does it take for a color change to deep blue or purple to occur in the oxidase test?
What is the purpose of using a petri dish in the catalase test?
What is the purpose of using a petri dish in the catalase test?
What does the motility test aim to determine?
What does the motility test aim to determine?
How is the motility test performed?
How is the motility test performed?
What is the significance of observing the formation of bubbles against a dark background in the catalase test?
What is the significance of observing the formation of bubbles against a dark background in the catalase test?
What is the source of electrons that the enzyme cytochrome c oxidase accepts during the oxidase test?
What is the source of electrons that the enzyme cytochrome c oxidase accepts during the oxidase test?
Why is the oxidase test used in microbiology?
Why is the oxidase test used in microbiology?
What material is used to inoculate the filter paper or commercial disk in the oxidase test?
What material is used to inoculate the filter paper or commercial disk in the oxidase test?
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