Explore topic-wise MCQs in Microbiology.

This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following bacterial colonies fluoresce brick-red in UV light?
A. <i>B gingivalis</i>
B. <i>B melaninogenicus</i>
C. <i>Bacteroides fragilis</i>
D. <i>B levii</i>
Answer» C. <i>Bacteroides fragilis</i>
Discussion
2.

The commonest bacterial cause of cervicofacial actinomycosis is
A. <i>A. naeslundii</i>
B. <i>A. viscosus</i>
C. <i>A. israelii</i>
D. <i>A. meyeri</i>
Answer» D. <i>A. meyeri</i>
Discussion
3.

Which of the following bacteria is moderately saccharolytic?
A. <i>Bacteriodes fragilis</i>
B. <i>B gingivalis</i>
C. <i>B melaninogenicus</i>
D. <i>B levii</i>
Answer» D. <i>B levii</i>
Discussion
4.

Which of the following bacteria is acid-fast?
A. <i>Actinomyces</i>
B. <i>Nocardia</i>
C. <i>Streptomyces</i>
D. <i>Corynebacterium</i>
Answer» C. <i>Streptomyces</i>
Discussion
5.

Lactobacilli constitute the normal flora of
A. prepubertal vagina
B. adult vagina
C. post-menopausal vagina
D. none of these
Answer» C. post-menopausal vagina
Discussion
6.

Which of the following bacteria is gram-negative cocci?
A. <i>Veillonella</i>
B. <i>Peptococcus</i>
C. <i>Peptostreptococcus</i>
D. <i>Sporosarcina </i>
Answer» B. <i>Peptococcus</i>
Discussion
7.

Which of the following genera is included in the family Bacteroi-daceae?
A. <i>Bacteroides</i>
B. <i>Fusobacterium</i>
C. <i>Leptotrichia</i>
D. All of these
Answer» E.
Discussion
8.

The current genus name of a saccharolytic group of Bacteroides is
A. <i>Porphyromonas</i>
B. <i>Bacteroides </i>
C. <i>Prevotella</i>
D. None of these
Answer» B. <i>Bacteroides </i>
Discussion
9.

Colonies resembling molar teeth are produced by
A. <i>Nocardia brasiliensis</i>
B. <i>N. asteroids</i>
C. <i>Actinomyces israelii</i>
D. <i>Actinomadura madurae</i>
Answer» D. <i>Actinomadura madurae</i>
Discussion
10.

The commonest species of Bacteroides in fragilis group, which causes human infection, is
A. <i>B vulgatus</i>
B. <i>B fragilis</i>
C. <i>B ovatus</i>
D. <i>B merdae</i>
Answer» C. <i>B ovatus</i>
Discussion
11.

The bacteria which is predominant flora of the human gut is
A. <i>Escherichia coli</i>
B. <i>Clostridium perfringens</i>
C. <i>Bacteroides</i>
D. <i>Actinomyces</i>
Answer» C. <i>Bacteroides</i>
Discussion