Test Your Knowledge - MICROBIOLOGY MCQ PRACTICE
by Saksham Chaudhry : Lancers Convent, Prashant Vihar, New Delhi 110085
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A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.
For each of the following multiple choice questions, choose the most appropriate answer :

1. Human transmission of Brucellae occurs by
A. ingestion of contaminated meat 
B. direct contact with animal tissues 
C. ingestion of infected milk 
D. all of these 

2. Colonies resembling molar teeth are produced by
A. Nocardia brasiliensis 
B. N. asteroids 
C. Actinomyces israelii 
D. Actinomadura madurae 

3. Shriveling in fermented pickles results from the physical effect of
A. too strong salt solution 
B. too strong sugar solution 
C. too strong vinegar solution 
D. all of these 

4. Holozoic nutrition is characterized by
A. phagocytosis of solid nutrients and subsequent formation of phagocytic vacuoles 
B. pinocytosis of solid nutrients and subsequent formation of phagocytic vacuoles 
C. phagocytosis of soluble nutrients and subsequent formation of phagocytic vacuoles 
D. photosynthesis 

5. __________is probably the most important characteristic for classification of viruses in eukaryotes.
A. Host preference 
B. Morphology 
C. Physical nature of virion constituents 
D. Chemical nature of virion constituents 

6. Most spoilage bacteria grow at
A. acidic pH 
B. alkaline pH 
C. neutral pH 
D. any of the pH 

7. Which of the following is an example of autoimmune disease?
A. Rheumatoid arthritis 
B. Systemic lupus erythematosus 
C. Polyarteritis nodosa 
D. All of the above 

8. Area of lysis on a bacterial lawn culture produced by a phage is known as
A. pock 
B. plaque 
C. pox 
D. all of these 

9. Which of the following mediates Type I hypersensitivity reaction?
A. IgE 
B. IgG 
C. IgM 
D. IgD 

10. Antigen binding sites of an immunoglobulin are located in
A. light chain alone 
B. heavy chain alone 
C. Fc region of the antibody 
D. Fab regions of the antibody 

11. All of the following species are considered coliforms except
A. Enterobacter aerogenes 
B. Klebsiella pneumoniae 
C. Salmonella typhi 
D. Escherichia coli 

12. The chromosome of almost all bacteria is in the shape of
A. an open circle 
B. helix 
C. a closed circle 
D. a linear chromosome 

13. Nitrogen fixation by the microorganisms can be detected by adopting the approach of
A. demonstrating growth in a nitrogen free medium 
B. cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen 
C. measuring15N2 by mass spectrometer 
D. all of the above 

14. Culture of tubercle bacilli may be positive if number of bacteria in the specimen is
A. as few as 1-4 per ml 
B. as few as 5-9 per ml 
C. as few as 10-100 per ml 
D. as few as 125-200 per ml 

15. In cellular metabolism, O2 is used
A. to provide electrons for photophosphorylation 
B. in glycolysis 
C. as a terminal electron acceptor 
D. in the Krebs cycle 

16. Some cyanobacteria produce potent neurotoxins that, if ingested, will kill humans. These cyanobacteria are most likely to contaminate
A. water rich in organic carbon wastes but poor in phosphate 
B. water that are anoxic 
C. water rich in phosphate wastes but poor in organic carbon 
D. none of the above 

17. Intracellular enzymes
A. synthesize cellular material only 
B. synthesize cellular material and perform catabolic reaction 
C. synthesize cellular material and perform anabolic reaction 
D. only provide energy to the cell 

18. The Redfield ratio is an index of concentration of
A. carbon, hydrogen and oxygen 
B. nitrogen, potassium and iron 
C. carbon, nitrogen and phosphorous 
D. carbon, phosphorous and sulfur 

19. Which of the following is not the characteristic of a growth curve?
A. Shows development of microbial population under relatively stable environmental conditions 
B. Plotted with logarithmic numbers 
C. Graphs numbers of microbes versus time 
D. Each growth curve consists of four distinct phases 

20. The bread mold Rhizopus stolonifer belongs to which of the following fungal divisions?
A. Ascomycota 
B. Deuteromycota 
C. Oomycota 
D. Zygomycota 

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