1. All of the following statements concerning immunity are true, except:The main function of the immune system is to prevent or limit infections by microorganisms such as bacteria, viruses, fungi, and parasitesProtection is provided primarily by the cell-mediated and antibody-mediated (humoral) arms of the immune systemTwo other major components of the immune system are complement and phagocytesThe cell-mediated arm consists primarily of B lymphocytes whereas the antibody-mediated arm consists of T lymphocytesQuestion 1 of 20 2. Which of the following has been shown to be the most effective antimicrobial agent for reducing plaque and gingivitis long-term?Phenolic compoundsStannous fluorideQuaternary ammonium compoundsChlorhexidineQuestion 2 of 20 3. Percentage of alcohol commonly used for optimum disinfection:60-80%10-20%30-50%5-10%Question 3 of 20 4. The process of gene transfer between bacterial cells that involves the uptake of naked DNA molecules is classified as which of the following?TransductionConjugationTransformationTranslocationQuestion 4 of 20 5. Visceral larva migrans is caused byToxocaraTineaLoa-loaEntrobius vermicularisQuestion 5 of 20 6. The basic chemical structure of endotoxins includes which of the following?H and L chain glycoproteinsCapsular polysaccharideAcid stable peptidoglycanSomatic O polysaccharide, core polysacchande, lipid AQuestion 6 of 20 7. Signs of typhoid fever is / areHaemorrhageAll of the aboveOsteomyelitisPerforationQuestion 7 of 20 8. Mycobacterium tuberculosis is differentiated from other atypical mycobacteria byAFB stainingNoneNiacin testPAS stainingQuestion 8 of 20 9. In poorly controlled Type I diabetes, most common infection is:MucormycosisRhinosporidiasisCryptococcusHistoplasmosisQuestion 9 of 20 10. Bacteria with tuft of flagella at one end are calledLophotrichateBipolarPeritrichateMonotrichateQuestion 10 of 20 11. Ig predominant in saliva is:IgDIgAIgEIgMQuestion 11 of 20 12. Which of the following is most resistant to antiseptics:FungusPrionCystSporeQuestion 12 of 20 13. Which of the following infections is not associated with congenital malformationsCytomegalovirusNeisseriaRubellaToxoplasmaQuestion 13 of 20 14. Process of tissue culture is known as?Chemical propagationMicro propagationMacro propagationVegetative propagationQuestion 14 of 20 15. J chain is seen in which immunoglobulin:IgDIgM and IgAIgG and IgMIgEQuestion 15 of 20 16. Not used in leptospirosis -Dark field illuminationMicroscopic agglutination testWeil felix reactionMacroscopic agglutination testQuestion 16 of 20 17. T lymphocytes are MOST directly involved in which of the following?Complement synthesisContact dermatitisImmune complex injuryImmediate hypersensitivityQuestion 17 of 20 18. All of the following protozoa may be detected by Fecal Acid Fast Stain, exceptCryptosporidiumMicrosporidiaCyclosporaIsosporaQuestion 18 of 20 19. The mechanism by which most fungi cause diseaseCoagulase productionHypersensitivityLecithinase productionExotoxin productionQuestion 19 of 20 20. The type of immunoglobulin most commonly increased in multiple myeloma isIgDIgGIgMIgAQuestion 20 of 20 Loading...