MCQ on Bacterial Pathogenesis (Medical Microbiology)

Multiple Choice Question on Bacterial Pathogenesis

1) Which of the following microorganism is the major inhabitant of the skin?
a) Escherichia coli
b) Staphylococcus epidermidis
c) Staphylococcus aureus
d) Streptococcus pyogens

2) Which one of the following is not the normal flora of the skin?
a) Diptheriods
b) Staphylococci
c) Helicobacter
d) Micrococci

3) All of the following are gram-negative bacilli EXCEPT
a) Proteus spp
b) Pseudomonas spp
c) Neisseria spp
d) Klebsiella spp

4) Which of the following cocci shaped bacteria is usually seen in pairs?
a) Klebsiella spp
b) Neisseria spp
c) Pseudomonas spp
d) Clostridium spp

5) Which one of the following pathogenic organism is capable of living inside the living cell only(obligate intracellular pathogen)?
a) Salmonella
b) Mycobacterium
c) Rickettsia
d) Vibrio

6) the common normal flora of upper respiratory tract
a) Lactobacillus spp
b) Staphylococcus spp
c) Vibrio spp
d) None of the above

7) Which of the following organism releases endotoxin that causes muscular paralysis?
a) Clostridium botulism
b) Bacillus cereus
c) Streptococcus pyogens
d) Salmonella typhi

8) Which of the following enzyme is used to distinguish between different types of Staphylococcus isolates?
a) Proteases
b) Lipase
c) Hyaluronidase
d) Coagulase

9) Which of the following is the predominant urogenital flora present during newborn female infants?
a) Candida albicans
b) Lactobacillus acidophilus
c) Escherichia coli
d) Neisseria gonorrohea

10) All of the given organisms are the predominant normal flora of human feces EXCEPT
a) Pseudomonas sps
b) Bacteroides sps
c) Enterococcus sps
d) Bacillus sps

11) Vector-borne bacterial pathogenesis is caused only when bacteria are transmitted into a host cell through a vector. Among these ................ is a vector-borne pathogen.
a) Salmonella typhi
b) Yersinia pestis
c) Shigella dysenteriae
d) Escherichia coli

12) Some bacteria and fungi need an iron receptors molecule for their growth, what is it called?
a) Siderophores
b) Ionophores
c) Siderocytes
d) None of the above

13) Which toxin is produced by Streptococcus pyogens?
a) Shiga like toxin
b) Alpha toxin
c) Erythrogenic toxin
d) Cyanotoxin

14) Which bacteria causes toxic shock syndrome
a) Staphylococcus epidermidis
b) Staphylococcus aureus
c) Staphylococcus intermedius
d) None of the above

15) Catalase test is the biochemical test used for identification of various bacteria. Which of the following bacteria is negative to this test?
a) Enterobacter
b) Pseudomonas
c) Corynebacterium
d) Streptococci

16) Staphylococcus aureus releases a various toxin that is important for their pathogenesis. Following are toxin released by S aureus EXCEPT:
a) Botulinum
b) Alpha
c) Leucocidin
d) Enterotoxin

17) Which pathogen is a major cause of dental disease?
a) Staphylococcus epidermidis
b) Streptococcus mutans
c) Staphylococcus aureus
d) Streptococcus agalactiae

18) The microorganism that commonly causes an eye infection is
a) Chlamydia trachomatis
b) Staphylococcus aureus
c) Streptococcus pneumoniae
d) Streptococcus sanguinis

19) The most significant bacteria found in acne is ........ acnes.
a) Staphylococcus
b) Streptococcus
c) Propionibacterium
d) Bacillus

20) Which of the following bacteria is predominantly present in normal urine?
a) Escherichia coli
b) Staphylococcus epidermidis
c) Staphylococcus aureus
d) Streptococcus pyogens

Multiple Choice Answer Review
1- b) Staphylococcus epidermidis
2-c) Helicobacter
3- c) Neisseria spp
4-b) Neisseria spp
5-c) Rickettsia
6- b) Staphylococcus spp
7-a) Clostridium botulism
8-d) Coagulase
9- b) Lactobacillus acidophilus
10-a) Pseudomonas sps
11-b) Yersinia pestis
12-a) Siderophores
13-b) Alpha toxin
14-b) Staphylococcus aureus
15-d) Streptococci
16-a) Botulinum
17-b) Streptococcus mutans
18-a) Chlamydia trachomatis
19-c) Propionibacterium
20-a) Escherichia coli

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