1. Lactobacilli grow best under

A. strict anaerobic conditions
B. microaerophilic conditions in presence of 5% CO₂ and PH6
C. microaerophilic conditions in presence of 3% CO₂ and PH5
D. microaerophilic conditions in presence of 2% CO₂ and PH4

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2. Which of the following genera is included in the family Bacteroi-daceae?

A. Bacteroides
B. Fusobacterium
C. Leptotrichia
D. All of these

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3. The bacteria which is predominant flora of the human gut is

A. Escherichia coli
B. Clostridium perfringens
C. Bacteroides
D. Actinomyces

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4. The current genus name of a saccharolytic group of Bacteroides is

A. Porphyromonas
B. Bacteroides
C. Prevotella
D. None of these

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5. Colonies resembling molar teeth are produced by

A. Nocardia brasiliensis
B. N. asteroids
C. Actinomyces israelii
D. Actinomadura madurae

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