Identification of Bacteria – Section 1

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16. Which of the following(s) is/ are oxidase-positive bacteria?

A. Vibrio
B. Neisseria
C. Pseudomonas
D. All of these

Correct Answer: D. All of these

17. What is the order of reagents used in the Gram stain?

A. Crystal violet, iodine, safranin, decolorizer
B. Crystal violet, iodine, decolorizer, safranin
C. Safranin, crystal violet, decolorizer, iodine
D. Crystal violet, safranin, iodine, decolorizer

Correct Answer: B. Crystal violet, iodine, decolorizer, safranin

18. Gram staining was developed accidentally in 1884 by

A. Alexander Fleming
B. Hans Christian Gram
C. Joseph Christian Gram
D. Robert Gram

Correct Answer: B. Hans Christian Gram

19. Which of the following organisms can be demonstrated with silver impregnation method?

A. Vibrios
B. Salmonella
C. Spirochaetes
D. Shigella

Correct Answer: C. Spirochaetes

20. Which of the following(s) show(s) positive results for phenylalanine deaminase test?

A. Providencia
B. Proteus
C. Morganella
D. All of these

Correct Answer: D. All of these
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