الدكتور/ مصطفى عراقى - Dr.Mostafa Eraqi

أستاذ مساعد الميكروبيولوجى والمناعة بكلية العلوم

اسئلة احياء دقيقة



1. Bacteria without cell Wall 
a- Chlamydia 
b- Rickettsia 
c- Mycoplasma 
d- Spirochetes 




2. Obligatory Aerobic Bacteria 
a- Grow in presence of oxygen traces and 5 – 10% CO2 
b- Grow in either presence or absence of oxygen. 
c- Grow only in presence of oxygen 
d- Grow only in absence of oxygen 


3. Brucella Melitensis is 
a- Obligatory aerobic bacteria 
b- Obligatory anaerobic bacteria 
c- Facultative anaerobic bacteria 
d- Micro-aerophilic bacteria 




4. Function of cell membrane 
a- Giving the shape to bacteria 
b- Carrying somatinc antigen 
c- Excretion of hydrolytic exo-enzymes and toxins 
d- Protect the bacteria from plasmolysis 




5. Pseudomonas aeroginosa is 
a- Peri-trichous bacteria 
b- Lopho-trichous bacteria 
c- Amphi-trichous bacteria 
d- Monotrichous bacteria 




6. Short rods, motile by single polar flagellum : 
a- Lactobacillus 
b- Spirochaeta 
c- Vibrio 
d- Streptococcus 




7. Genetic information of bacteria is carried on 
a- Messenger RNA 
b- Transfer RN|A 
c- Transcript RNA 
d- Double – Stranded DNA 








 





8. Thermophilic bacteria grow at 
a- 60 –80°C 
b- 0 - 20°C 
c- 37°C 
d- 100 - 120°C 




9. Acidophilic bacteria grow at 
a- pH 7.2 – 7.4 
b- pH 5.0 – 5.5 
c- pH 8.5 – 9.0 
d- None of the above 




10. Mycoplasma is 
a- Neutrophilic bacteria 
b- Acidophilic bacteria 
c- Basophilic bacteria 
d- All of the above 




11. It is the adaptation of bacteria to the fresh medium 
a- Lag phase 
b- Decline phase 
c- Logarithmic Phase 
d- Stationary phase 




12. Bacteria which do not cause hemolysis is 
a- Beta-Hemolytic 
b- Alpha-Hemolytic 
c- Gama Hemolytic 
d- None of the above 




13. Normal flora of Lower intestine are all of the following except: 
a- Staphylococci 
b- Diphtheroids 
c- Shigella 
d- Lactobacillus 




14. Opportunistic pathogens are all of the following except: 
a- Cause a disease when the host defense are suppressed. 
b- Are normal flora of healthy body 
c- Are greatly harmful 
d- Do not invade the body or tissue. 




15. It is circulation of bacterial toxins in blood 
a- Pyaemia 
b- Toxemia 
c- Bacteremia 
d- Septicemia 






16. Inhibit the growth of micro-organisms 
a- Germicidal 
b- Germistatic 
c- Pathogenicity 
d- Virulence 




17. For disinfection of mattresses : 
a- Hot air oven 
b- Autoclave 
c- Ethylene Oxide 
d- Hydrogen Peroxide 




18. For sterilization of serum : 
a- Autoclave 
b- Boiling 
c- Steaming 
d- Filtration 




19. Obligatory Anaerobic bacteria: 
a- Clostridium Tetani 
b- Salmonella 
c- M. Tuberculosis 
d- E-coli 




20. Pyschrophilic bacteria grow at: 
a- 100°C 
b- 60°C 
c- 14°C 
d- 37°C 




21. Bacteria which contain chlorophyll 
a- Heterotrophic bacteria 
b- Autotrophic bacteria 
c- Photosynthetic bacteria 
d- All of the above 




22. Selective media for fungi is: 
a- Sabouraud’s dextrose agar 
b- Lowenstein – Jensen Media 
c- Loeffler’s media 
d- Chocolate agar 




23. Tricophyton is one of 
a- Yeast 
b- Moulds 
c- Dermatophyte 
d- Dimorphic Fungi 








 





24. Plastomyces is one of 
a- Dermatophytes 
b- Dimorphic Fungi 
c- Yeast 
d- Moulds 




25. Mechanism of action of penicillin: 
a- Inhibit protein synthesis 
b- Inhibit Folic acid pathway 
c- Inhibit peptidoglycan cross – linking 
d- Block peptidoglycan synthesis 




26. Antibiotics which inhibit DNA synthesis: 
a- Rifampin 
b- Quinolones 
c- Sulfonamides 
d- Tetracylines 




27. Color of gram negative bacteria is 
a- Violet 
b- Green 
c- Red 
d- Black 




28. Acid Fast Bacteria 
a- Salmonella 
b- Shigella 
c- M. Tuberculosis 
d- E . Coli 




29. Vibrio Cholera is: 
a- Neutrophilic Bacteria 
b- Acidophilic Bacteria 
c- Basophilic Bacteria 
d- All of the above 




30. Spherical or avoid cells occurring in chains 
a- Staphylococci 
b- Streptococci 
c- Lactobacillus 
d- Spiro chaeta 




31. All are Prokaryotic cells except: 
a- Fungi 
b- Bacteria 
c- Chlamydia 
d- Mycoplasma 








 





32. Viruses: 
a- Contain only DNA or RNA 
b- They Contain ribosome 
c- Did not affected by antibiotics 
d- a + c 




33. All of these are essential structure except: 
a- Nuclear body 
b- Spores 
c- Cell wall 
d- Plasma Membrane 




34. ______________ is giving the shape to the bacteria 
a- Cytoplasmic Membrane 
b- Capsule 
c- Cell Wall 
d- All of the above 




35. One of its functions is selective permeability 
a- Cell wall 
b- Plasma membrane 
c- Capsule 
d- Spores 




36. They are responsible for Haemagglutination Phenomenon 
a- Flagella 
b- Fimbria 
c- Capsule 
d- Cell wall 




37. Clostridium Tetani is: 
a- Atrichous bacteria 
b- Mono-trichous bacteria 
c- Amphi-trichous bacteria 
d- Peri-trichous bacteria 




38. Short curved or straight rods, motile by single polar flagellum 
a- spirochaeta 
b- Vibrio 
c- Escherichia 
d- Lactobacillus 




39. Small gram negative cocci, occur in pairs 
a- staphylococcus 
b- streptococcus 
c- neisseria 
d- non of the above 








 





40. Transfer of genetic information from one bacterium to another by bacteriophages is: 
a- Transformation 
b- Tansduction 
c- Conjugation 
d- Mutation 




41. Salmonella are: 
a- Obligatory Aerobic bacteria 
b- Obligatory Anaerobic bacteria 
c- Facultative Anaerobic bacteria 
d- Micro-aerophilic bacteria 




42. According to pH, vibrio cholera is 
a- Osmophilic bacteria 
b- Basophilic bacteria 
c- Acidophilic bacteria 
d- Neutrophilic bacteria 




43. Staphylococci are: 
a- Atrichous bacteria 
b- Mono-trichous bacteria 
c- Amphi-trichous bacteria 
d- Peri-trichous bacteria 




44. During replication of DNA, copying errors may occur and this is called 
a- Conjugation 
b- Transduction 
c- Transformation 
d- Mutation 




45. Obligatory Anaerobic bacteria 
a. grow only in presence of oxygen 
b. grow only in absence of oxygen 
c. grow either in presence or absence of oxygen 
d. grow in presence of oxygen traces and 5 – 10% CO2 
















46. Neutrophilic bacteria grow well at 
a- pH 8.5 – 9.0 
b- pH 7.2 – 7.4 
c- pH 5.0 – 5.5 
d- pH 2.5 – 3.0 




47. The rate of cell death increase and bacterial growth stopped, this is 
a- Adaptation phase 
b- Exponential phase . 
c- Stationary phase. 
d- Decline Phase 








 





48. Beta-hemolytic 
a- Cause complete hemolysis of RBC’s .... 
b- Cause chemical change of Hemoglobin in RBC’s 
c- Do not cause hemolysis 
d- None of them 




49. Mesophilic bacteria grow at: 
a- 37°C 
b- 14°C 
c- 60°C 
d- 120°C 




50. Circulation of Bacteria and its toxins in blood 
a- Pyaemia 
b- Toxemia 
c- Bacteremia 
d- Septicemia 




51. Disinfections that applied on living or injured tissues: 
a- Sterilization 
b- Antiseptic 
c- Sanitation 
d- Decontamination 




52. Hot air oven is used for sterilization of 
a- Glass 
b- Rubber Gloves 
c- Plastic Syringes 
d- Catheters 




53. Disinfectant for superficial fungal infection 
a- Phenol 
b- Potassium permanganate 
c- Chlorine 
d- Hypochlorite compounds 




54. Rifampin 
a- inhibit cell wall synthesis 
b- inhibit protein synthesis 
c- inhibit folic acid pathway 
d- inhibit mRNA synthesis 




55. Transacetylase inactivate 
a- aminoglycosides 
b- chloramphenicol 
c- penicillin 
d- cephalosporins 








 





56. The color of gram positive bacteria is 
a- Yellow 
b- Black. 
c- Pink 
d- Violet 




57. Selective media for fungi 
a- blood agar 
b- Mac Conkey agar 
c- Nutrient agar 
d- Sabourand’s dextrose agar 




58. Histoplasma is a : 
a- Systemic mycosis 
b- Sub – Cutaneous mycosis 
c- Cutaneous mycosis 
d- Superficial mycosis 




59. All are asexual spores produced by mould except 
a- Conidio – spores 
b- Sporangio – spores 
c- Endospores 
d- Arthro – spores 




60. They reproduce only by Asexual reproduction 
a- Blastomycosis 
b- Deutromycosis 
c- Ascomycetes 
d- Zygomycetes 




61. The functions of cell wall is all of the following except: 
a- Giving the shape to the bacteria 
b- Carrying somatic antigen 
c- Selective permeability and transport of solutes 
d- Protect the bacteria from plasmolysis 




62. Atrichous Bacteria are: 
a- Bacteria contain one flagellum 
b- Bacteria contain 2 flagella 
c- Bacteria without flagella 
d- Bacteria with a tuft of flagella 




63. ________________ are essential for host cell attachment: 
a- Flagella 
b- Fimbria 
c- Spores 
d- Capsules 








 





64. Irregular clusters of spherical cells: 
a- Streptococcus 
b- Staphylococcus 
c- Lactobacillus 
d- Escherichia 




65. Clostridium Botulinum is: 
a- Obligatory Aerobic Bacteria 
b- Facultative Anaerobic Bacteria 
c- Obligatory Anaerobic Bacteria 
d- Micro- aerophilic Bacteria 




66. Basophilic Bacteria grow well at: 
a- pH 8.5 – 9.0 
b- pH 7.2 – 7.4 
c- pH 5.0 – 5.5 
d- None of the above 




67. Cells are divided at high & constant rate: 
a- Decline Phase 
b- Stationary Phase 
c- Log Exponential Phase 
d- Adaptation Phase 




68. The dominant bacterial species in dental plaque are: 
a- Coagulase Negative Staphylococci 
b- Lactobacillus 
c- Bacteroides 
d- Streptococcus Sanguis 




69. The spread of Pyogenic Bacteria in blood stream to different organs & produce 
multiple abscess is: 
a- Septicemia 
b- Bacteremia 
c- Toxemia 
d- Pyaemia 




70. Inhibit the growth of micro organisms 
a- Bacteriostatic 
b- Bactericidal 
c- Fungicidal 
d- Germicidal 




71. To sterilize fluid damaged by heat: 
a- Gaseous Sterilization 
b- Heat Sterilization 
c- Filtration 
d- Ionizing Radiation 








 



72. For water disinfection we use: 
a- Hydrogen peroxide 
b- Formaldehyde 
c- Chlorine 
d- Hypochlorite compounds 




73. Mechanism of action of penicillin: 
a- Block peptidoglycan synthesis4 
b- Inhibit peptidyglycan cross – linking 
c- inhibit folic acid pathway 
d- inhibit protein synthesis 




74. Sulfonamides: 
a- inhibit cell wall synthesis .... 
b- inhibit protein synthesis 
c- inhibit DNA synthesis 
d- inhibit folic acid pathway 




75. Acetylase inactivates: 
a- B – Lactam antibiotics 
b- Aminoglycosides 
c- Cloramphenicol 
d- All of the above 




76. Ringworm disease is caused by 
a- Zygomycetes 
b- Ascomycetes 
c- Blastomycosis 
d- None of the above 




77. Histoplasm is one of 
a. Superficial Mycosis 
b. Cutaneous Mycosis 
c. Sub – Cutaneous Mycosis 
d. Systemic Mycosis 
















78. For wet – mount technique we add: 
a. NaOH 
b. K OH 
c. H2 O2 
d. All of the above 
















79. Eukaryotic cells: 
a. Bacteria 
b. Spirochetes 
c. Protozoa 
d. Mycoplasma 




















 





80. All of these about viruses is correct except: 
a. Obligatory intracellular parasites 
b. Did not contain ribosomes. 
c. Contain DNA and RNA 
d. Can pass through bacterial filter 
















81. They are transmitted by arthropods 
a. Chlamydia 
b. Spirochetes 
c. Mycoplasma 
d. All of the above 
















82. In the past they were listed as large viruses 
a. Richettsia 
b. Mycoplasma 
c. Chlamydia 
d. None of the above 
















83. Bacteria multiply by: 
a. Replication cycle 
b. Simple binary fission 
c. Sexual reproduction 
d. All of the above 
















84. One of the accessory structures 
a. Cell wall 
b. Plasma Membrane 
c. Flagella 
d. Cytoplasm 
















85. It protects bacteria from antibiotics 
a. Capsule 
b. Cell membrane 
c. Flagella 
d. Fimbria 
















86. Vibro cholera is: 
a. Mono –trichous bacteria 
b. Atrichous bacteria 
c. Lopho-trichous bacteria 
d. Peri-trichous bacteria 
















87. Short rods, motile by peritrichous flagella 
a. Spirochaeta 
b. Lactobacillus 
c. Escherichia coli 
d. Vibrio 




















 





88. To take up soluble DNA fragments derived from other, closely related species is: 
a. Mutation 
b. Transformation 
c. Transduction 
d. Conjugation 
















89. Tuberculosis are 
a. micro-airophilic 
b. Facultative anaerobic 
c. Obligatory anaerobic 
d. Obligatory aerobic 
















90. According to pH, Lactobacillusis 
a. Neutrophlic bacteria 
b. Acidophilic bacteria 
c. Basophilic bacteria 
d. None of the above 
















91. function of the cell wall is: 
a- support plasma membrane 
b- cell division 
c- Replication 
d- Non of the above 




92. function of cytoplasmic membrane is: 
a- transport of solutes into the cell 
b- excretion of hydrolytic 
c- a & c 
d- all of the above 




93. capsules staining done by: 
a- Indian ink 
b- polychrome methylene blue: 
c- a & b 
d- non of the above 




94. function of bacterial capsule is: 
a- essential for bacterial virulence 
b- help in diagnosis of bacteria 
c- protection bacteria 
d- all of the above 




95. function of bacterial flagella is: 
a- essential for motility 
b- important for diagnosis 
c- carrying flagellar antigen 
d- all of the above 








 





96. bacteria classification according to bacterial flagella: 
a- atrichous 
b- mono-trichous 
c- amphi- atrichous 
d- all of the above 




97. types of bacterial motility: 
a- motility by flagella 
b- motility by cell body 
c- giliding motility 
d- all of the above 




98. fimbriae are differing from flagella in the: 
a- shorter 
b- more number 
c- present in motile and non-motile bacteria 
d- all of the above 




99. function of fimbriae: 
a- essential for host cell attachment 
b- responsible for heamagglutination 
c- a & b 
d- non of the above 




100. bacterial endospores use to resistant of: 
a- disinfection 
b- dryness 
c- heat 
d- all of the above 








 






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