1. Which type of hypersensitivity reaction listed below is characterized by a specific cytotropic antibody (IgE) that binds to receptors on basophils and mast cells and reacts with a specific antigen?Type IVType IIType IllType IQuestion 1 of 20 2. Effector region of immunoglobulin isConstant region of light and heavy chainVariable region of light and heavy chainVariable region of heavy chainConstant region of heavy chainQuestion 2 of 20 3. Septic arthritis is caused byPseudomonasE. coliChlamydiaS. aureusQuestion 3 of 20 4. An infection is epidemic if:It is constantly present at a low level in a specific populationIt occurs much more frequently than usualIt has a worldwide distributionIt is highly communicableQuestion 4 of 20 5. All of the following infections may be transmitted by dental instruments exceptHIVHepatitis EHepatitis CHepatitis BQuestion 5 of 20 6. During a Type I hypersensitivity reaction, leukotrienes and prostaglandin D are generated from which of the following?Arachidonic acidHistamineThymusBradykinin and other kininsQuestion 6 of 20 7. Phage conversion is required for:TularemiaGonorrhoeaDiphtheriaAll of the aboveQuestion 7 of 20 8. Opsonization is done by:PlateletsInterferonLTB4C3bQuestion 8 of 20 9. ELISA is:A radiologic procedureAn enzymatic immune reactionA pioneer in dentistryA name of a scientistQuestion 9 of 20 10. Staphylococci typically occurs inTetradsChainsPairsIrregular ClustersQuestion 10 of 20 11. Which of the following is not a rapidly growing atypical mycobacteria causing lung infectionsM.fortuitumM.abscessusM. chelonaeM.kansasiiQuestion 11 of 20 12. Multiple drug resistance of bacteria depends on which of the following:All of aboveFertility factor (F +)Colicigenic factor (Col)Resistance transfer factor (RTF)Question 12 of 20 13. Delayed tuberculin test response is due toB LymphocytesMonocytesT lymphocytesHistiocytesQuestion 13 of 20 14. Which of the following represents the phenotypic expression of both alleles in a gene pairHybridizationPenetranceCodominanceLyonizationQuestion 14 of 20 15. Which of the following is characteristic infection' caused by Nocardia:Colonic diverticulosisDiarrheaBrain abscessSecondary dissemination to liverQuestion 15 of 20 16. All of the following statements concerning bacterial plaque are true, except:It is the key etiologic agent in the initiation of gingivitis and periodontal diseaseIt is composed of solids (80%; 95% of which are bacteria) and water (20%)It forms on a cleaned tooth within minutesIt is an accumulation of a mixed bacterial community in a dextran matrixQuestion 16 of 20 17. The genetic ability of a bacterium to grow in the presence of several antibiotics is passed from one bacterium to other byTransductionTransformationConjugationRarefactionQuestion 17 of 20 18. Best method of sterilizing disposable syringes:BoilingHot air ovenUV raysGamma raysQuestion 18 of 20 19. Which of the following bacteria is c-AMP positiveS. agalactaciaeStaph. AureusS. pyogenesPneumococciQuestion 19 of 20 20. Adjuvant given along with antigens are going toreduce the toxigenicityreduce the antigenicityincrease toxigenicityincrease antigenicityQuestion 20 of 20 Loading...