MCQ on Normal Flora



1. Which of the following microorganism are the most commonly found normal flora in a healthy human body?
a) Bacteria      
b) Fungi
c) Parasites
d) Viruses
 
2. Which of the following microorganism is a part of the normal flora of the skin and is also a common pathogen isolated from skin infections?
a) Bacillus anthracis
b) E. coli
c)Staphylococcus aureus        
d)Candida albicans

3. Name a fungus that is a part of the normal flora present in the vagina and is also the common cause of vaginitis?
a) Candida albicans    
b) Cryptococcus neoformans
c) Helicobacter pylori
d) Plasmodium falciparum

4. Which of the following microorganism is a predominant flora of the skin?
a) Bacillus anthracis
b) Clostridium perfringens
c) Leptospira interrogans
d) Staphylococcus epidermidis

5. Name a fungus commonly found as a part of the normal flora in the nails 
a) Pseudomonas spp
b) Mycobacterium spp
c)  Aspergillus spp 
d) Histoplasma spp

6) Which of the following microorganism can be found as normal flora in the nasopharynx of healthy individuals?
a) Mycobacterium tuberculosis
b) Streptococcus pneumoniae 
c) Clostridium difficile
d) Bacillus cereus
 
7) Which of the following bacteria is present as normal flora in the acidic pH of the vagina?
a) Clostridium botulinum
b) Lactobacillus acidophilus   
c) Neisseria gonorrhoeae
d) Streptococcus mutans

8) Which of the following coliform bacteria is predominant in the human gastrointestinal tract?
a) Bacillus cereus
b) Vibrio cholerae
c) Lactobacillus acidophilus
d) Escherichia coli

9) Select all the beneficial roles of normal flora present in the human body
a) Provides defense against microbial pathogens
b) Helps in the digestion of food
c) Contributes to the development of the immune system
d) Overgrow to become pathogenic in the immunocompromised patients

10. Which of the following bacteria is a part of normal flora present inside the mouth and also a frequent cause of bacterial dental caries?
a) Staphylococcus epidermidis
b) Lactobacillus acidophilus
c) Streptococcus mutans
d) Candida albicans



Answers:
1. a) Bacteria  
2. c)Staphylococcus aureus  
3. a) Candida albicans    
4. d) Staphylococcus epidermidis
5. c) Aspergillus spp 
6. b) Streptococcus pneumoniae 
7. b) Lactobacillus acidophilus 
8. d) Escherichia coli
9. a), b) and c)
10. c) Streptococcus mutans








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