Explore topic-wise MCQs in Microbiology.

This section includes 20 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 haemolysins does not possess leucocidal activity?

A. α haemolysin
B. γ haemolysin
C. β haemolysin
D. δ haemolysin
Answer» D. δ haemolysin
Discussion
2.

food poisoning usually manifests itself following ingestion of contaminated food after

A. 2-6 hours
B. 8-12 hours
C. 12-18 hours
D. 18-36 hours
Answer» B. 8-12 hours
Discussion
3.

Which of the following does not cause lysis of human RBCs?

A. β haemolysin
B. γ haemolysin
C. α haemolysin
D. δ haemolysin
Answer» D. δ haemolysin
Discussion
4.

The toxin of that may result into scalded skin syndrome is

A. Enterotoxin
B. Leucocidin
C. Epidermolytic toxin
D. Haemolysin
Answer» D. Haemolysin
Discussion
5.

Most strains of indicate

A. phosphatase production
B. a golden-yellow pigment
C. β-haemolysis on sheep blood agar
D. all of the above
Answer» E.
Discussion
6.

Which of the following Staphylococcal haemolysins does not possess leucocidal activity?
A. haemolysin
B. haemolysin
C. haemolysin
D. haemolysin
Answer» D. haemolysin
Discussion
7.

Identify the bacteria which is oxidase-negative and catalase-positive?
A. <i>Staphylococcus</i>
B. <i>Streptococcus</i>
C. <i>Neisseria</i>
D. <i>Pseudomonas</i>
Answer» B. <i>Streptococcus</i>
Discussion
8.

The bacteria which is novobiocin resistant is
A. <i>Staphylococcus aureus</i>
B. <i>S epidermidis</i>
C. <i>S saprophyticus</i>
D. None of these
Answer» D. None of these
Discussion
9.

The bacteria which are inhibited on crystal violet (1:500,000) blood agar, is/are
A. <i>Streptococci</i>
B. <i>Staphylococci</i>
C. Both (a) and (b)
D. None of these
Answer» C. Both (a) and (b)
Discussion
10.

The genus/genera that belongs to the family Micrococcaceae is
A. <i>Micrococcus</i>
B. <i>Staphylococcus</i>
C. <i>Planococcus</i>
D. All of these
Answer» E.
Discussion
11.

The most common cause of cystitis (after Escherichia coli) in healthy sexually active women is
A. <i>Staphylococcus saprophyticus</i>
B. <i>Proteus mirabilis</i>
C. <i>Pseudomonas aeruginosa</i>
D. <i>Klebsiella pneumoniae</i>
Answer» B. <i>Proteus mirabilis</i>
Discussion
12.

Most strains of Staphylococcus aureus indicate
A. phosphatase production
B. a golden-yellow pigment
C. -haemolysis on sheep blood agar
D. all of the above
Answer» E.
Discussion
13.

Which of the following can be used to detect clumping factor?
A. tube coagulase test
B. slide coagulase test
C. precipitation test
D. none of these
Answer» C. precipitation test
Discussion
14.

Coagulase-reacting factor is necessary for
A. slide coagulase test
B. tube coagulase test
C. precipitation test
D. none of these
Answer» C. precipitation test
Discussion
15.

Bacteria which produces coagulase is
A. <i>S epidermidis</i>
B. <i>S saprophyticus</i>
C. <i>S aureus</i>
D. <i>S hominis</i>
Answer» D. <i>S hominis</i>
Discussion
16.

Staphylococcal food poisoning usually manifests itself following ingestion of contaminated food after
A. 2-6 hours
B. 8-12 hours
C. 12-18 hours
D. 18-36 hours
Answer» B. 8-12 hours
Discussion
17.

Which of the following Staphylococcal haemolysins does not cause lysis of human RBCs?
A. haemolysin
B. haemolysin
C. haemolysin
D. haemolysin
Answer» D. haemolysin
Discussion
18.

The toxin of Staphylococcus aureus that may result into scalded skin syndrome is
A. Enterotoxin
B. Leucocidin
C. Epidermolytic toxin
D. Haemolysin
Answer» D. Haemolysin
Discussion
19.

Protein A is found in cell wall of
A. coagulase-negative
B. <i>staphylococci</i>
C. <i>Staphylococcus aureus</i>
D. <i>Micrococci</i>
E. none of these
Answer» C. <i>Staphylococcus aureus</i>
Discussion
20.

The bacteria which can ferment mannitol anaerobically is
A. <i> Staphylococcus aureus</i>
B. <i>S epidermidis</i>
C. <i>S saprophyticus</i>
D. None of these
Answer» B. <i>S epidermidis</i>
Discussion