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1) Anaerobic bacteria grow_______________? a. in the presence of oxygen b. in the presence of nitrogen c. in the absence of oxygen d. differential media
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2) The bacterial cell wall has all of the following properties except______________? a. It consists of a mixed polymer called peptidoglycon b. It is the structure principally responsible for the reaction of gram staining c. It is a unique flexible plastic structure d. It contains D-isomers of amino acids
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3) Each of the following can cause food poisoning except________________? a. Cl. difficile b. Staphylococcus c. Cl. welchii d. Cl. botulinum
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4) The following are applicable to bacterial genoms except________________? a. It is composed of DNA b. It doe not contain histones c. It is circular d. Its DNA has both introns and extrons
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5) Electron microscopic examination of the bacterial flora of necrotising ulcerative gingivitis indicates the presence of microorganisms within non-necrotic tissues in advance of other bacteria. The organisms involved are______________? a. Cocci b. Spirochetes c. Bacteriophages d. Filamentous rods
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6) The structure in involved in bacterial attachment to cell surface is_______________? a. Capsule b. Fimbria c. Flagella d. None of the above
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7) Signs of tyhoid fever is/are_____________________? a. Haemorrhage b. perforation c. Osteomyelitis d. All of the above
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8) In initial stages of tyhoid, salmonella can be detected in________________? a. Feacus b. Urine c. Blood d. All of the above
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9) On a stained slide, clostridium tetani has the appearance of a__________________? a. Bunch of a b. Chain of beads c. Drum stick d. Safely pin
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10) The urine sample of a patient has been sent to the laboratory to look for Leptospira. The specimen is to be screened by use of the__________________? a. Scanning microscope b. Inverted microscope c. Dark ground microscope d. Electron microscope
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11) Which of the following fulfil all the criterias of kich’s postulates ? a. Treponema pallidum b. Mycobacterium leprae c. N. gonorrhoeae d. None of the above
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12) Among The infectious diseases transmitted by food, one is___________________? a. Viral stomatitis b. Diptheria c. Tuberculosis d. Typhoid fever
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13) Black pigmented anaerobes include all of the following except______________? a. Tannerella b. Porphyromonas c. Buccae d. Prevotella
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14) All are true about bordetella pertussis except______________? a. Most common cause is B. Petrussis b. It may occur in children and young adult after vaccination c. Bacteria culture from nasopharyngeal swab is the definitive diagnosis d. Presence of antibodies in serum in diagnostic of the disease
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15) A full course of immunization agianst. Telanus with 3 doses to Tetanus toxoid, confers immunity for how many years ? a. 5 b. 10 c. 15 d. 20
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16) Salivary peroxidise system is known to be effective agianst________________? a. Actinomyces viscosus b. Lactobacillus acidophilus c. Streptococcus mutans d. Veilonella parvula
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17) About Psedomonas. All are true except________________? a. Strick aerobes b. Can grow in disinfectants in hospital c. Infection is mostly due to endogenous source d. Most common organism is burn patient
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18) Lepromin test is useful for________________? a. Diagnosis b. Prognosis c. Treatment plan d. Epidemiology
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19) All are true about widel test except________________________? a. Base lines differ depending on the endemicity of the disease b. O antibodiest last longer and hence is not indicative of recent infection c. H antigen cannot differentiate between subtypes d. High titre value in a single widal test is not confirmative
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20) Leptospirosis, all are true except______________? a. Faeces & urine of rodents is the cause b. Onset of IgM in 2 days c. Incubation period is 10 days d. It is sensitive to penicillin
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21) Pathogenesis of diphtheria is attributed to__________________? a. Invasion b. Endotoxin c. Exotoxin d. Capsule
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22) Following are the characteristics of Vincent’s angina EXCEPT_______________? a. Ulcerative gingivostomatitis b. Caused due to malnutrition c. A symbiotic infection d. Caused by leptospira interrogans
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23) ASO (Antistreptolysin 0) test is uesd for the diagnosis of________________? a. Rheumatoid arthritis b. Typhoid fever c. Rheumatie fever d. Rickettsial fever
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24) Group A carbohydrate of Str. pyogenes cross reacts with human_________________? a. Synovial fluid b. Myocardium c. Cardiac valves d. Vascular intima
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25) The most frequently encountered clostridial species in gas gangrene is______________? a. Clostridium botulinum b. Clostridium welchii c. Clostridium tetani d. Clostridium difficile
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26) In small intestine, cholera toxin acts by______________? a. ADP – ribosylation of the G regulatory protein b. Inhibition of adenyl cyclase c. Activation of GTPase d. Active absorption of NaCI
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27) Phospholipid used to investigate syphilis by the reagin test is________________? a. Cardiolipin b. Plasminogen c. Palmityl lecithin d. Serine
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28) Staphylococcal food poisoning includes the following features_______________? a. Incubation period of 24 hours b. Requires immediate antibiotics c. Common with dairy products d. Heat labile enterotoxin
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29) Fimbriae are demonstrated by ___________________? a. Culture b. Gram stain c. Biochemical reaction d. Haemagglutination test
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30) The mechanism of genetic transfer where a phage serves as a vehicle is_______________? a. Transduction b. Translation c. Lysogeny d. Conjugation
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