MCQOPTIONS
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MCQOPTIONS
This section includes 165 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When the gametes are morphologically alike, they are called ______________ |
| A. | isogametes |
| B. | anisogametes |
| C. | macrogametes |
| D. | microgametes |
| Answer» B. anisogametes | |
| 2. |
Protozoa are generally not |
| A. | multicellular |
| B. | microscopic |
| C. | lacking cell walls |
| D. | eukaryotic |
| Answer» B. microscopic | |
| 3. |
Which of the following is not a function of cysts for Protozoa? |
| A. | Protect against adverse environments |
| B. | Sites for nuclear reorganization and cell division |
| C. | Serve as a means of transfer between hosts in parasitic species |
| D. | All of the above |
| Answer» E. | |
| 4. |
The bacteria, which is more resistant to adverse environmental conditions, is |
| A. | S sonnei |
| B. | S dysenteriae |
| C. | S flexneri |
| D. | S boydii |
| Answer» B. S dysenteriae | |
| 5. |
Which of the following is least likely to have a rigid cell wall? |
| A. | Bacterium |
| B. | Archaean |
| C. | Fungus |
| D. | Protozoan |
| Answer» E. | |
| 6. |
Amoebas carry on a special kind of respiration in the form of exchange of gases between the cell and the surrounding field. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 7. |
Which of the following type of fission takes place in flagellates? |
| A. | longitudinal |
| B. | right angle to the cell axis |
| C. | transverse |
| D. | cytoplasm protrudes from the aperture |
| Answer» B. right angle to the cell axis | |
| 8. |
Human pathogenic bacteria is/are |
| A. | B pseudomallei |
| B. | Burkholderia mallei |
| C. | Pseudomonas aeruginosa |
| D. | All of these |
| Answer» E. | |
| 9. |
Characteristics used to place algae into divisions include all of the following except |
| A. | form of storage material |
| B. | flagella number and location |
| C. | accessor pigments used in photosynthesis |
| D. | all of the above |
| Answer» E. | |
| 10. |
Trypanosoma belongs to which of the following order? |
| A. | Kinetoplastida |
| B. | Retortamonadida |
| C. | Choanoflagellida |
| D. | Trichomonadida |
| Answer» B. Retortamonadida | |
| 11. |
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 |
| Answer» B. pinocytosis of solid nutrients and subsequent formation of phagocytic vacuoles | |
| 12. |
Heat-stable enterotoxin of Escherichia coli activates |
| A. | adenylate cyclase |
| B. | guanylate cyclase |
| C. | both of the above |
| D. | none of these |
| Answer» C. both of the above | |
| 13. |
Which algal division is divided up into three main groups consisting of the golden-brown algae, the yellow-green algae and the diatoms? |
| A. | Chlorophyta |
| B. | Chrysophyta |
| C. | Phaeophyta |
| D. | Pyrrophyta |
| Answer» C. Phaeophyta | |
| 14. |
A protozoan is defined as |
| A. | motile prokaryotic unicellular protist |
| B. | motile eukaryotic unicellular protist |
| C. | motile eukaryotic unicellular photosynthetic protist |
| D. | motile eukaryotic multicellular protist |
| Answer» D. motile eukaryotic multicellular protist | |
| 15. |
Pseudomonas aeruginosa can be diagnosed from the pigment, known as |
| A. | Pyocyanin |
| B. | Pyoverdin |
| C. | Pyomelanin |
| D. | Pyorubrin |
| Answer» B. Pyoverdin | |
| 16. |
Which of the following infection(s) can be caused by Pseudomonas aeruginosa? |
| A. | Urinary tract infection |
| B. | Wound and burn infection |
| C. | Respiratory tract infection |
| D. | All of these |
| Answer» E. | |
| 17. |
Dysentery may be caused by |
| A. | enteropathogenic Escherichia coli |
| B. | enteroinvasive E. coli |
| C. | enterotoxigenic E. coli |
| D. | verotoxigenic E. coli |
| Answer» D. verotoxigenic E. coli | |
| 18. |
Which of the following determine the pathogenicity of Yersinia pestis? |
| A. | V and W antigens |
| B. | F1 envelope antigen |
| C. | Production of pigmented colonies on haemin containing media |
| D. | All of these |
| Answer» E. | |
| 19. |
The most popular method for typing of Pseudomonas aeruginosa is |
| A. | antibiogram |
| B. | serotyping |
| C. | bacteriophage |
| D. | pyocin |
| Answer» E. | |
| 20. |
Example of the pathogenic bacteria is/are |
| A. | L biflexa |
| B. | Lparva |
| C. | Leptospira interrogans |
| D. | All of these |
| Answer» D. All of these | |
| 21. |
The number of members of the division Phaeophyta that live in freshwater habitats |
| A. | is greater than the number of members of the division Chloro-phyta that live in freshwater habitats |
| B. | is lesser than the number of members of the division Chlorophyta that live in freshwater habitats |
| C. | is equal to the number of members of the division Chlorophyta that live in freshwater habitats |
| D. | none of the above |
| Answer» C. is equal to the number of members of the division Chlorophyta that live in freshwater habitats | |
| 22. |
Which of the following is the commonest species of Salmonella for causing zoonotic disease? |
| A. | S Indiana |
| B. | S newport |
| C. | S typhimurium |
| D. | S enteritidis |
| Answer» D. S enteritidis | |
| 23. |
Which of the following(s) bacteria belong to the family Entero-bacteriaceae? |
| A. | Yersinia |
| B. | Shigella |
| C. | Salmonella |
| D. | All of these |
| Answer» E. | |
| 24. |
Organisms are parasitic and have a resistant spore with one to six coiled polar filaments belong to which phylum of Protozoa? |
| A. | Labyinthomorpha |
| B. | Sarcomastigophora |
| C. | Apicomplexa |
| D. | Myxozoa |
| Answer» E. | |
| 25. |
Which of the following algal divisions is characterized by possession of chlorophylls A and B, paramylon as the energy storage material, and the presence of a pellical instead of a cell wall? |
| A. | Chlorophyta |
| B. | Euglenophyta |
| C. | Pyrrophyta |
| D. | Chrysophyta |
| Answer» C. Pyrrophyta | |
| 26. |
Members of the Protozoa may motile by all of the following methods except |
| A. | flagella |
| B. | gliding by slime secretion |
| C. | cilia |
| D. | pseudopodia |
| Answer» C. cilia | |
| 27. |
During asexual binary fission the macronucleus divides by mitotic division. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 28. |
The media which serve(s) as enrichment media for Salmonella is/are |
| A. | Tetrathionate broth |
| B. | Brilliant green tetrathionate broth |
| C. | Selenite-F broth |
| D. | All of these |
| Answer» E. | |
| 29. |
Which of the following bacteria is/are known as coliform bacilli? |
| A. | Escherichia |
| B. | Klebsiella |
| C. | Enterobacter |
| D. | All of these |
| Answer» E. | |
| 30. |
Definite exogenous budding occurs in which of the following species of protozoa? |
| A. | foraminifera |
| B. | radiolaria |
| C. | suctorians |
| D. | heliozoa |
| Answer» D. heliozoa | |
| 31. |
Which of the following is not true of protozoa? |
| A. | Lack cell wall |
| B. | Produce no sporebearing structures |
| C. | Comprise the microbial population known as phytoplankton |
| D. | Form active feeding forms called trophozoites |
| Answer» D. Form active feeding forms called trophozoites | |
| 32. |
During binary fission in Paramecium, the rear daughter cell receives a new gullet? |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 33. |
Xylose lysine deoxycholate (XLD) agar is better selective medium than the deoxycholate citrate agar (DCA) because |
| A. | it is selective |
| B. | it imparts better growth |
| C. | it contains high salt concentration |
| D. | it is less inhibitory to S. Dysentriae and S. flexneri |
| Answer» E. | |
| 34. |
An enrichment medium for the isolation of Shigella is |
| A. | Alkaline peptone water |
| B. | Terathionate broth |
| C. | Selenite F broth |
| D. | none of these |
| Answer» D. none of these | |
| 35. |
The substance(s) which can be produced by strains of Pseudomonas aeruginosa is/are |
| A. | Exotoxins A and S |
| B. | Elastase |
| C. | Haemolysins |
| D. | All of these |
| Answer» E. | |
| 36. |
The reaction(s) that is/are usually positive in Escherichia coli, is/ are |
| A. | Glucose fermentation |
| B. | Indole reaction |
| C. | Methyl red reaction |
| D. | All of these |
| Answer» E. | |
| 37. |
The algae Chlamydomonas demonstrates a complex life cycle that switches between haploid and diploid forms. This life cycle is called |
| A. | the sexual-asexual exchange |
| B. | the transposition cycle |
| C. | an alternation of generations |
| D. | algal transformation |
| Answer» D. algal transformation | |
| 38. |
Starch is an energy storage material characteristic of |
| A. | chlorophyta |
| B. | chrysophyta |
| C. | phaeophyta |
| D. | rhodophyta |
| Answer» E. | |
| 39. |
Undigested particles are eliminated from the cell through the ___________________ |
| A. | gullet |
| B. | contractile vacuole |
| C. | cytoproct |
| D. | cell membrane |
| Answer» D. cell membrane | |
| 40. |
Primarily human pathogenic bacteria is/are , |
| A. | Salmonella typhi |
| B. | S paratyphi A |
| C. | S paratyphi B |
| D. | all of these |
| Answer» E. | |
| 41. |
Which of the following media is selective for Salmonella? |
| A. | Thiosulphate citrate bile salt agar |
| B. | Wilson and Blair's brilliant-green bismuth sulphite agar medium |
| C. | Bile salt agar |
| D. | All of the above |
| Answer» C. Bile salt agar | |
| 42. |
Which of the following describes the function of a phagocytic vacuole? |
| A. | Contain specific enzymes that perform various functions |
| B. | Maintain osmotic balance by continuous water expulsion |
| C. | Structures that accept male gametes during sexual reproduction |
| D. | Sites of food digestion |
| Answer» E. | |
| 43. |
Spirochaetes exhibit |
| A. | corkscrew-like rotatory movement |
| B. | flexion and extension motility |
| C. | translatory motion |
| D. | all of the above |
| Answer» E. | |
| 44. |
Which of the following serotypes of Salmonella does not produce H2S? |
| A. | S choleraesuis |
| B. | S paratyphi A |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 45. |
In Widal test, the significant titre for O agglutinins is generally |
| A. | 1:50 or more |
| B. | 1:100 or more |
| C. | 1:150 or more |
| D. | 1:2.00 or more |
| Answer» C. 1:150 or more | |
| 46. |
Which of the following species/subspecies of Klebsiella produce indole? |
| A. | K pneumoniae subspecies rhinoscleromatis |
| B. | K pneumoniae subspecies aerogenes |
| C. | K pneumoniae subspecies pneumoniae |
| D. | K oxytoca |
| Answer» E. | |
| 47. |
The __________ is the vegetative body of algae. |
| A. | mycelium |
| B. | plasmodium |
| C. | pseudoplasmodium |
| D. | thallus |
| Answer» E. | |
| 48. |
Algae are classified into 6 groups, technically known as |
| A. | categories |
| B. | divisions |
| C. | genera |
| D. | domains |
| Answer» C. genera | |
| 49. |
Selective media for the isolation of Shigella is |
| A. | Hektoen enteric agar |
| B. | Salmonella-Shigella agar |
| C. | Xylose lysine deoxycholate agar |
| D. | All of these |
| Answer» E. | |
| 50. |
The swarming daughter cells possess special locomoter organelles like the parent cell. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |