MCQs MICROBIOLOGY: Actinomycetes and Non Sporing Anaerobes

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
Answer & Explanation
Answer: Option B

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

A. Bacteroides
B. Fusobacterium
C. Leptotrichia
D. All of these
Answer & Explanation
Answer: Option D

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

A. Escherichia coli
B. Clostridium perfringens
C. Bacteroides
D. Actinomyces
Answer & Explanation
Answer: Option B

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

A. Porphyromonas
B. Bacteroides
C. Prevotella
D. None of these
Answer & Explanation
Answer: Option A

5.
Colonies resembling molar teeth are produced by

A. Nocardia brasiliensis
B. N. asteroids
C. Actinomyces israelii
D. Actinomadura madurae
Answer & Explanation
Answer: Option C

6.
Which of the following bacterial colonies fluoresce brick-red in UV light?

A. B gingivalis
B. B melaninogenicus
C. Bacteroides fragilis
D. B levii
Answer & Explanation
Answer: Option B

7.
Which of the following bacteria is acid-fast?

A. Actinomyces B. Nocardia
C. Streptomyces D. Corynebacterium
Answer & Explanation
Answer: Option B

8.
Lactobacilli constitute the normal flora of

A. prepubertal vagina
B. adult vagina
C. post-menopausal vagina
D. none of these
Answer & Explanation
Answer: Option B

9.
Which of the following bacteria is gram-negative cocci?

A. Veillonella
B. Peptococcus
C. Peptostreptococcus
D. Sporosarcina
Answer & Explanation
Answer: Option A

10.
The commonest species of Bacteroides in fragilis group, which causes human infection, is

A. B vulgatus
B. B fragilis
C. B ovatus
D. B merdae
Answer & Explanation
Answer: Option B

11.
The commonest bacterial cause of cervicofacial actinomycosis is

A. A. naeslundii
B. A. viscosus
C. A. israelii
D. A. meyeri
Answer & Explanation
Answer: Option C

12.
Which of the following bacteria is moderately saccharolytic?

A. Bacteriodes fragilis
B. B gingivalis
C. B melaninogenicus
D. B levii
Answer & Explanation
Answer: Option C