MCB TEST 3 1 Skin is difficult for bacteria to colonize because it is A Dry B Acidic C Salty D Oily E All of these A Nightingale B Snow C Pasteur D Semmelweis E Koch A Direct Contact B Vector C Fomite D Droplet E Vehicle A Droplet B Vehicle C Vector D Fomite E Direct Contact 2 showed that improved sanitation decreases the incidence of epidemic typhus 3 A sexually transmitted disease is an example of transmission by 4 Yellow fever transmitted by a mosquito is an example of transmission by 5 A nosocomial infection is A Acquired during the coarse of hospitalization B Always caused by pathogenic bacteria C Always present but inapparent at the time of hospitalization D Always caused by medical personnel E Only a result of surgery 6 Poliovirus is ingested and gains access to tissues by which of the following portal of entries A Skin B Mucous membranes C Parenteral D All of these E None of these 7 Which of the following organisms would be most sensitive to natural penicillin A Peniccillium B Streptococcus pyogenes C Penicillinase producing Neisseria Gonorrhoeae D Mycoplasma E Common cold virus 8 Which of the following statements about antibiotic resistance is NOT true A It may be spread horizontally from one bacterium to another B It is found only in Gram negative bacteria C It may be encoferred by genes encoded on a plasmid or a transposon D It may be caused by inappropriate usage of antibiotics 9 In Table 1 the most effective antibiotic against Staphylococcus aureus is 10 In table 1 which antibiotic would be most useful for treating and E Coli infection A A B B C C D D E Can t tell 11 is the least abundant in the serum but plays important role in allergy disorder 12 The most abundant class of antibodies in serum is A A B B C C D D E Can t tell A IgG B IgM C IgA D IgD E IgE A IgG B IgM C IgA D IgD E IgE 13 In Figure 1 which areas represent antigen binding sites 14 In figure 1 which areas represent the variable domains A a and b B a and c C b and c D c and d E b and d A a and b B a and c C b and c D c and d E b and d 15 Which of the following would be selective against the tubercle bacillus A Isoniazid inhibits mycolic acid synthesis B Streptomycin inhibits protein translation C Vancomycin inhibits peptidoglycan synthesis D Streptogramin inhibits protein synthesis E Bacitracin inhibits cell wall synthesis 16 Which of the following strains of Legionella pneumophila most easily causes an infection A Strain A ID50 200 cfu B Strain B C Strain C D Strain D ID50 5000 cfu ID50 50 cfu ID50 500 cfu 17 The host immunity in response to infection of H1N1 influenza virus is and example of A Innate immunity B Naturally acquired active immunity C Naturally acquired passive immunity D Artificially acquired active immunity E Artificially acquired passive immunity 18 Vaccination results in A Innate immunity B Naturally acquired active immunity C Naturally acquired passive immunity D Artificially acquired active immunity E Artificially acquired passive immunity 19 Which of these groups of bacteria are the source of the most antibiotics 20 Which of the following is an effect of complement activation A Alpha Proteobacteria B Beta Proteobacteria C Gamma Proteobacteria D Delta Proteobacteria E Actinomycetes A Increased blood vessel permeability B Increased phagocytic activity C Opsonization D Bacterial cell lysis E All of these A Antigen antibody reactions B Polysaccharides and C3b C C5 C9 D Factors released from damaged tissues E Factors released from phagocytes 21 The classical pathway for complement activation is initiated by 22 Which of the following statements is true A Interferon attacks and dissolves invading viruses B Interferon interacts with antigens C Interferon acts against specific viruses D Interferon is a secreted protein induced by a viral infection E Interferon competitively binds to viral receptors thus blocks viral entry into cells 23 Which of the following is not considered as a bacterial virulence factor A A membrane disrupting enzyme B Cell wall components C Toxin D Bacterial factors involved in adhesion of bacteria to host cells E None of these 24 Which of the following is not a protein A Exotoxin B Endotoxin C Toxoid D Antitoxin E Antibody 25 Which of the following substances is given to patients exposed to Tetanus toxin 26 Hepatitis B virus surface antigen can be used in a n A Inactivated whole agent vaccine B Attenuated whole agent vaccine C Conjugated vaccine D Subunit vaccine E Toxoid vaccine 27 Which of the following cells are the main components of cell mediated immune response A Endotoxin B Toxoid C Exotoxin D Enterotoxin E Antitoxin A T cells B B memory cells C B cells D Plasma cells E Macrophages 28 Which of the following can be used as an antiviral therapeutic strategy A Inhibitor of viral attachment B Inhibitor of viral protease C Inhibitor of viral genome replication enzyme D Inhibitor of viral uncoating E All of these 29 Haemophilius influenzae B vaccine consisting of capsular polysaccharide and a protein is an example of an A Conjugated vaccine B Subunit vaccine C Nucleic acid vaccine D Inactivated whole agent vaccine E Toxoid vaccine A WHO B USDA C FDA D CDC E NONE OF THESE 30 Which of the following agency publishes Morbidity and Mortality Weekly Report MMWR
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