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

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

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

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

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

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

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

5. Colonies resembling molar teeth are produced by

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