Staplylococcus(Microbiology ) Questions and answers for exam Preparation

Question 1. The bacteria which is novobiocin resistant is

Staphylococcus aureus
S saprophyticus
None of these
S epidermidis

Explanation:-

Answer: Option B. -> S saprophyticus

Question 2. The genus/genera that belongs to the family Micrococcaceae is

Staphylococcus
Planococcus
All of these
Micrococcus

Explanation:-

Answer: Option C. -> All of these

Question 3. Which of the following Staphylococcal haemolysins does not possess leucocidal activity?

γ haemolysin
δ haemolysin
β haemolysin
α haemolysin

Explanation:-

Answer: Option C. -> β haemolysin

Question 4. Identify the bacteria which is oxidase-negative and catalase-positive?

Staphylococcus
Neisseria
Pseudomonas
Streptococcus

Explanation:-

Answer: Option A. -> Staphylococcus

Question 5. The bacteria which are inhibited on crystal violet (1:500,000) blood agar, is/are

Streptococci
Both (a) and (b)
None of these
Staphylococci

Explanation:-

Answer: Option D. -> Staphylococci

Question 6. Coagulase-reacting factor is necessary for

slide coagulase test
tube coagulase test
precipitation test
none of these

Explanation:-

Answer: Option B. -> tube coagulase test

Question 7. The toxin of Staphylococcus aureus that may result into scalded skin syndrome is

Epidermolytic toxin
Leucocidin
Haemolysin
Enterotoxin

Explanation:-

Answer: Option A. -> Epidermolytic toxin

Question 8. Bacteria which produces coagulase is

S hominis
S saprophyticus
S epidermidis
S aureus

Explanation:-

Answer: Option D. -> S aureus

Question 9. Which of the following Staphylococcal haemolysins does not cause lysis of human RBCs?

γ haemolysin
β haemolysin
α haemolysin
δ haemolysin

Explanation:-

Answer: Option C. -> α haemolysin

Question 10. Staphylococcal food poisoning usually manifests itself following ingestion of contaminated food after

8-12 hours
18-36 hours
12-18 hours
2-6 hours

Explanation:-

Answer: Option D. -> 2-6 hours