1. The gram-negative organisms is

A. Actinomyces
B. Bacillus
C. Clostridium
D. None of these

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2. Catalase production is negative in which of the following?

A. Streptococcus
B. Salmonella
C. Proteus
D. Staphylococcus

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3. Which of the following is a substitute for crystal violet used in gram-staining procedure?

A. Methylene blue
B. Bromocresol green
C. Safranin
D. Phenolpthalene

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4. Which of the following inference(s) indicate(s) the ability of an organism to utilize citrate as a sole source of carbon in Simmon’s citrate medium?

A. Blue colour
B. Appearance of growth
C. Both (a) and (b)
D. None of these

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5. The organisms that can be acid-fast stained is

A. Nocardia
B. Tubercle bacilli
C. Lepra bacilli
D. all of these

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