Quiz Answers

Quiz Answers

  1. Gas gangrene bacillus is
    • a. Facultative anaerobe
    • b. Obligate anaerobe ✅
    • c. Facultative aerobe
    • d. Obligate aerobe

  2. Coagulase test is used for
    • a. Salmonella
    • b. Staphylococcus ✅
    • c. Bordetella
    • d. Pneumococcus

  3. HIV is belonging to
    • a. Retro Viridae ✅
    • b. Rhabdo Viridae
    • c. Toga Viridae
    • d. Paramyxo Viridae

  4. Special feature of Retro viruses
    • a. Reverse transcriptase
    • b. RNA directed DNA polymerases
    • c. Both a & b ✅
    • d. Boils

  5. AIDS virus is
    • a. RNA virus
    • b. DNA virus
    • c. Retro virus ✅
    • d. Entero virus

  6. AIDS is caused by
    • a. HTLV – I
    • b. Bunya virus
    • c. HTLV – III
    • d. All ✅

  7. Which of the following organisms is most commonly associated with AIDS pneumonia?
    • a. Klebsiella
    • b. Str. pneumonia
    • c. Mycoplasma
    • d. Mycobacterium tuberculosis ✅

  8. Seroconversion in HIV infection takes place in
    • a. 3 weeks
    • b. 6 weeks
    • c. 9 weeks ✅
    • d. 12 weeks

  9. Following is the marker of HIV infection in blood:
    • a. Reverse transcriptase ✅
    • b. DNA polymerase
    • c. RNA polymerase
    • d. None of these

  10. Which of the following is the most specific in diagnosis of AIDS?
    • a. IHA
    • b. Western blot ✅
    • c. ELISA
    • d. Immuno electrophoresis

  11. The interval period between HIV infection and appearance of antibodies in serum is called
    • a. Intrinsic period
    • b. Incubation period
    • c. Window period ✅
    • d. None of these

  12. Screening test for AIDS is
    • a. Western blot test
    • b. ELISA test ✅
    • c. Both a and b
    • d. VDRL test

  13. Confirmatory test for AIDS is
    • a. Western blot test ✅
    • b. ELISA test
    • c. Karpas test
    • d. Fujerbio test

  14. The most common infection in AIDS is
    • a. LGV
    • b. CMV
    • c. Pneumocystis carinii ✅
    • d. Syphilis

  15. During AIDS, HIV infects
    • a. CD3 lymphocytes
    • b. CD4 lymphocytes ✅
    • c. CD2 lymphocytes
    • d. B lymphocytes

  16. Lab diagnosis of Leishmaniasis is done by
    • a. CFT
    • b. Peripheral smear
    • c. Blood culture
    • d. All of these ✅

  17. Those fungi which do not have a sexual stage are classified as
    • a. Phycomycetes
    • b. Ascomycetes
    • c. Basidiomycetes
    • d. Fungi imperfecti ✅

  18. Tinea capitis is
    • a. Ringworm of the foot
    • b. Ringworm of scalp
    • c. Ringworm of non-hairy skin of the body ✅
    • d. Both a and c

  19. Diagnosis of bacterial disease can be made by
    • a. Finding bacteria in pathological fluids
    • b. Isolation of bacteria by culture from exudates or blood
    • c. Both a and b ✅
    • d. None of these

  20. Staphylococcus aureus are characterized by
    • a. Formation of acid in sucrose, dextrose
    • b. Liquefaction of gelatin due to production of gelatinase
    • c. Strains are catalase positive ✅
    • d. All of the above
    • e. None of these

  21. Cholera occurs in _ form
    • a. Endemic
    • b. Epidemic
    • c. Sporadic
    • d. All ✅
    • e. None of these

  22. Endemic typhus is caused by
    • a. R. mooseri ✅
    • b. R. quintana
    • c. R. prowazekii
    • d. Any of them
    • e. None of these

  23. A man is usually infected for tick typhus by –
    • a. Drinking milk of sick animals
    • b. Tending cattle
    • c. Inhaling infected dust ✅
    • d. All of these

  24. In Gram-positive bacteria, the ratio of RNA to DNA is
    • a. 8 : 1 ✅
    • b. 1 : 2
    • c. Almost equal
    • d. None of these

  25. Ziehl-Neelson stain is a __
    • a. Simple stain
    • b. Counter stain
    • c. Differential stain ✅
    • d. None of them

  26. Wet mount slide preparations are used in microbiology as they allow to see
    • a. Size and shape of individual organisms
    • b. Characteristic arrangement or grouping of cells
    • c. Motility of the organism
    • d. All of these ✅
    • e. None of these

  27. Organism resistant to degradative lysosomal enzymes includes
    • a. M. tuberculosis
    • b. Legionella pneumophila
    • c. M. leprae
    • d. Both a and b
    • e. Both b and c ✅

  28. Freeze-etch particles (used in preparing cells for electron microscopy) can be located in the
    • a. Cytoplasm
    • b. Cell wall
    • c. Cell membrane ✅
    • d. Nucleus

  29. The properties common to Gram-positive and Gram-negative cell walls are
    • a. Equal susceptibility to hydrolysis by lysozyme
    • b. Peptide crosslinks between polysaccharides
    • c. Rigid peptidoglycan activity
    • d. Greater resistance to drying than vegetative cells. ✅
    • e. All of these

  30. The main difference in true bacteria and mycoplasma is that it does not possess –
    • a. Flagella
    • b. Cell wall ✅
    • c. ATP synthesis
    • d. A capsule

  31. The organism responsible for retarding penetration of host cells by an inhibitor of ATP synthesis.
    • a. M. pneumoniae
    • b. Rickettsia rickettsii ✅
    • c. Chlamydia trachomatis
    • d. Chlamydia psitacci

  32. Mycoplasmas differ from Chlamydia in that, it
    • a. Has ability to cause urinary tract infection
    • b. Lack of a true bacterial cell wall ✅
    • c. Susceptible to penicillin
    • d. All of these
    • e. None of these

  33. Fungal disease in humans is caused by –
    • a. Inhalation of conidia
    • b. Invasion of mucous membranes
    • c. Contamination of wounds with conidia or mycelial fragments
    • d. All of these ✅
    • e. None of these

  34. Fungi differ with bacteria in that it –
    • a. Contain no peptidoglycan
    • b. Are prokaryotic
    • c. Susceptible to griseofulvin
    • d. Have nuclear membranes
    • e. All of these ✅

  35. A polysaccharide capsule is present on Cryptococci which –
    • a. Inhibits phagocytosis ✅
    • b. Is an aid to diagnosis
    • c. Cross-reacts with rheumatoid factor
    • d. All of these

  36. The largest protozoan is –
    • a. Balantidium coli ✅
    • b. Entamoeba coli
    • c. Trichomonas vaginalis
    • d. Toxoplasma gondii

  37. Premunition is particularly seen in –
    • a. Ascaris
    • b. Giardia
    • c. Plasmodium ✅
    • d. None of these

  38. Which of the following vaccines contains an attenuated form of bacteria?
    • a. BCG ✅
    • b. TAB
    • c. Polio
    • d. Cholera

  39. The bacteria, which is motile at 22°C but non-motile at 37°C is
    • a. Transformation
    • b. Transduction
    • c. Conjugation
    • d. Cell fusion ✅

  40. Teichoic acid is –
    • a. Found in the walls of Gram-positive bacteria ✅
    • b. Provide receptors for phages
    • c. Make up the outer wall of Gram-negative bacteria
    • d. Influence the permeability of the membrane

  41. One flagellum at one end of the organism is called –
    • a. Monotrichate ✅
    • b. Amphitrichate
    • c. Lophotrichate
    • d. Peritrichate

  42. What is the function of the bacterial capsule?
    • a. Production of organism from phagocytosis
    • b. Helps in adherence of bacteria to surfaces in its environment
    • c. Both a and b ✅
    • d. None of these

  43. Which of the following is the characteristic of bacterial spores?
    • a. Highly refractile
    • b. Usually dehydrated
    • c. Sensitive to formaldehyde
    • d. All of these ✅

  44. Which of the following are acid-fast structures?
    • a. Mycobacteria
    • b. Bacterial spores
    • c. Nocardia
    • d. All of these ✅

  45. All of the following are acid-fast structures except
    • a. Clostridium ✅
    • b. Bacterial spores
    • c. Exoskeleton
    • d. None of these

  46. All of the following are energy sources of bacteria except
    • a. Oxidation of inorganic compounds
    • b. Oxidation of organic compounds
    • c. Absorption of heat ✅
    • d. Utilization of visible light

  47. Identify the obligate anaerobes
    • a. Salmonella
    • b. Vibrio cholerae
    • c. Cl. tetani ✅
    • d. Sarcinae

  48. Streptococci which are destroyed at 60°C for 30 minutes
    • a. Peptostreptococci
    • b. Strepto viridans
    • c. Strepto hemolyticus
    • d. All of these ✅

  49. Toxins or enzymes which are not produced by Streptococcus pyrogenes
    • a. Hyaluronidase ✅
    • b. Phosphatase
    • c. Hemolysin
    • d. Streptokinase

  50. Cholera red reaction is identified by
    • a. Sulphuric acid ✅
    • b. Nitric acid
    • c. Hydrochloric acid
    • d. Carbolic acid

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