Medical Microbiology BSc MCQs Set-3

Medical Microbiology

1. The causative agent of tetanus is 

a. Clostridium botulinum 
b. Cl. tetani 
c. Cl. welchii 
d. Cl. perfringens 

Answer:b. Cl. tetani

2. The mode of spread of tetanus neurotoxin from blood to brain is 

a. Via lymphatics 
b. Arterial blood 
c. Cranial nerves 
d. None of these

 Answer:c. Cranial nerves

3. Tetanus is caused by spread of 

a. Exotoxin in sympathetic system 
b. Exotoxin in parasympathetic system 
c. Endotoxin in sympathetic system 
d. Endotoxin in parasympathetic system 

Answer:a. Exotoxin in sympathetic system

4. The first symptom of tetanus is 

a. Lock jaw 
b. Trismus 
c. Anorexia 
d. Dysphagia 

Answer:b. Trismus

5. Of which clostridia, the neurotoxin is most powerful? 

a. Cl. tetani 
b. Cl. welchii 
c. Cl. botulism 
d. Cl. septicum 

Answer:c. Cl. botulism

6. Toxin produced by C. botulism is 

a. Botulin
b. Tetanospasmin 
c. Tetanolysin 
d. Cholaragen 

Answer:a. Botulin

7. “Toxic shock syndrome” is caused by the toxin of 

a. Staphylococcus aureus 
b. Streptococcus pyogen 
c. Vibrio cholerae 
d. Candida 

Answer:a. Staphylococcus aureus 

8. Causative agent of syphilis 

a. T. pallidum 
b. T. pertenue 
c. T. carateum 
d. T. endemicum 

Answer:a. T. pallidum

9. Spirochaetes are sensitive to 

a. Penicillin 
b. Chloramphenicols 
c. Erythromycin 
d. Tetracycline 

Answer:b. Chloramphenicols 

10. Specific test for syphilis is 

a. VDRL test 
c. FTA 
d. None of these 

Answer:a. VDRL test 

11. VDRL test is a 

a. Agglutination test 
b. Slide flocculation test 
c. Precipitation test 
d. None of these 

Answer:b. Slide flocculation test 

12. The following characters are true about Neisseria gonorrhoeae except 

a. Gram-negative, aerobic bacteria 
b. Non-motile diplococci 
c. Oxidase positive organisms 
d. Air borne infection 

Answer:d. Air borne infection

13. Gonorrhoea is 

a. Air borne disease
b. Water borne disease 
c. Sexually transmitted venereal disease 
d. Both a and c 

Answer:c. Sexually transmitted venereal disease 

14. Bartholin cyst is caused by 

a. Candida 
b. Streptococcus
c. Staphylococcus 
d. Gonococcus 

Answer:d. Gonococcus

15. Neisseria gonorrhoeae causes 

a. Urethritis 
b. Conjunctivitis 
c. Arthritis 
d. All of the above 

Answer:d. All of the above

16. Virulence in gonococcus is due to 

a. Pili 
b. Cell membrane 
c. Its cellular location 
d. Cyclic enzymes 

Answer:a. Pili 

17. Japanese encephalitis is caused by 

a. Toga Viruses 
b. Arboviruses 
c. Paramyxoviruses 
d. Orthomyxoviruses 

Answer:b. Arboviruses 

18. In India, Japanese b encephalitis was first isolated from the mosquitoes of the 

a. Culex tritaeniorhynchus 
b. Culex annulirostris 
c. Culex vishnui 
d. None of these

 Answer:c. Culex vishnui

19. Dengue virus is transmitted from man to man by the 

a. Sand fly 
b. Ticks 
c. Aedes aegypti 
d. Culex 

Answer:c. Aedes aegypti

20. Yellow fever is caused by 

a. Bunya virus 
b. Calicivirus 
c. Arbovirus 
d. None of these

 Answer:c. Arbovirus 

21. Vector for leishmaniasis is 

a. Tick 
b. Mite 
c. Sand fly 
d. Tsetse fly

 Answer:c. Sand fly

22. Splenomegaly is an important manifestation of 

a. Kala-agar 
b. Typhoid 
c. Malaria 
d. All of these

Answer:d. All of these

23. Which of the following is most severely affected in Kala-azar? 

a. Liver 
b. Spleen 
c. Adrenal gland
d. Bone marrow 

Answer:b. Spleen

24. In India, malaria most often spreads by 

a. Anopheles culicifacies 
b. Anopheles fluviatilis 
c. Anopheles stephensi 
d. Anopheles minimus 

Answer:a. Anopheles culicifacies 

25. Man is an intermediate host for 

a. Guinea Worm 
b. Filaria 
c. Malaria 
d. Kala-azar

Answer:c. Malaria

26. Which of the following preferably infects reticulocytes? 

a. P. ovale 
b. P.vivax 
c. P.falciparum 
d. P.malaria 

Answer:b. P.vivax

27. In which type of material are parasites in the exoerythrocytic stage absent? 

a. P.ovale
b. P.vivax 
c. P.falciparum 
d. P. malariae 

Answer:c. P.falciparum 

28. In falciparum malaria, all of the following stages are seen except 

a. Ring stage 
b. Schizont 
c. Gametocyte 
d. None of these 

Answer:b. Schizont 

29. Sporozoite vaccine in malaria has 

a. Induces antibodies 
b. Prevents only asexual forms with reproduction 
c. No effects on clinical illness
d. None of the above 

Answer:a. Induces antibodies

30. Growing trophozoites and schizonts are not seen in the peripheral blood in malaria due to 

a. P. falciparum 
b. P.vivax 
c. P.ovale 
d. P. malaria 

Answer:a. P. falciparum

31. Thin blood smear for malaria is used to identify 

a. Plasmodium 
b. Gametocytes 
c. Type of parasite 
d. Schizont 

Answer:c. Type of parasite

32. The radical treatment of malaria is to half 

a. Gametocyte 
b. Exo-erythrocytic phase 
c. Erythrocytic phase 
d. All of these 

Answer:c. Erythrocytic phase

33. Symptoms of acute aflatoxicosis 

a. Osteogenic sarcoma 
b. Lymphatic leukemia 
c. Malaise & Anorexia 
d. Both a and b 

Answer:d. Both a and b 

34. Most important Penicillium toxins are 

a. Citrinin 
b. Patulin 
c. Penicillic acid 
d. All of the above 

Answer:d. All of the above 

35. Penicillic acid is produced by 

a. A. ochraceus 
b. P. puberulum 
c. Both a and b 
d. None of the above

 Answer:c. Both a and b 

36. Fungi producing mycelium are called 

a. Moulds 
b. Filamentous fungi 
c. Both a and b 
d. Yeasts 

Answer:a. Moulds

37. Candidiasis is caused by 

a. Candida albicans 
b. Aspergillus spp. 
c. E. floccosum 
d. M. audouinii

 Answer:a. Candida albicans 

38. Candida albicans is capable to form 

a. Single cells 
b. Pseudomonas 
c. Multicellular forms 
d. None of these

Answer:b. Pseudomonas

39. Aspergillus fumigatus can infect 

a. A. niger 
b. A. fumigatus 
c. A. flavus 
d. A. oryzae 

Answer:d. A. oryzae

40. A.fumigates can produce 

a. Endotoxins 
b. Exotoxins
c. Enterotoxins 
d. None of these 

Answer:a. Endotoxins

41. The drug of choice for dermal, oral and vaginal candidiasis is 

a. Griseofulvin 
b. Amphotericin B 
c. Gentian violet 
d. Nystatin 

Answer:c. Gentian violet

42. The following Penicillium species are pathogenic except 

a. P. commune 
b. P. bicolor 
c. P. glaucum 
d. P.notatum 

Answer:d. P.notatum

43. Tinea versicolor is caused by

a. Candida albicans 
b. Malassezia furfur 
c. Aspergillus niger 
d. None of these 

Answer:b. Malassezia furfur

44. Causative agent of Tinea nigra 

a. Malassezia furfur 
b. Exophiala werneckii 
c. Candida albicans 
d. Aspergillus flavus 

Answer:b. Exophiala werneckii 

45. Causative agent of African histoplasmosis 

a. Histoplasma capsulatum 
b. Histoplasma duboisii 
c. Aspergillus niger 
d. Aspergillus flavus 

 Answer:b. Histoplasma duboisii 

46. Sun ray fungus is 

a. Actinomyces israelii 
b. Chromoblastomycosis 
c. Streptomyces griseus 
d. Cryptococcosis 

Answer:a. Actinomyces israelii 

47. Which agent in addition to a colony inhibits its growth and on removal the colony regrows? 

a. Bacteriostatic 
b. Bactericidal
c. Antibiotic 
d. Antiseptic 

Answer:a. Bacteriostatic

48. Griseofulvin is obtained from 

a. Penicillium notatum 
b. Streptomyces griseus 
c. Penicillium griseofulvin 
d. None of these 

Answer:c. Penicillium griseofulvin

49. β-lactam ring is present in 

a. Erythromycin 
b. Penicillin 
c. Tetracycline 
d. Chloramphenicol 

Answer:b. Penicillin

50. All of the following drugs act on cell membrane, except 

a. Novobiocin 
b. Nystatin 
c. Chloromycetin 
d. Colicins

Answer:d. Colicins