Med Miro Exams Combined solutions 2023/2024

Med Miro Exams Combined 1. Legionella can be definitively diagnosed by a: Twofold rise in anti- Legionella antibody with an IFA Single serum with a titer of 128 Monoclonal immunofluorescent stain Gram stain Monoclonal immunofluorescent stain 2. Which of the following organisms are PYR positive? Selected Answer: Group A Streptococcus Group B Streptococcus S. urinalis Enterococcus spp. a and c only a, c, and d a, c, and d 3. Which organism is not a normal inhabitant of the respiratory tract? M. catarrhalis N. meningitidis N. mucosa N. gonorrhoeae N. gonorrhoeae 4. Which of the following is a leading sexually transmitted infection? N. gonorrhoeae N. meningitidis N. sicca N. mucosa N. gonorrhoeae 5. Which of the following media is not acceptable for primary growth of N. gonorrhoeae? Chocolate Thayer-Martin Blood Martin-Lewis Blood 6. Transcription is the: Copying of DNA to RNA Changing of DNA to RNA Production of a complementary DNA Completion of a protein sequence Copying of DNA to RNA 7. Which organism is able to hydrolyze esculin and is a serious nosocomial pathogen? S. bovis S. mitis E. faecalis S. pneumonia E. faecalis 8. What is the antibiotic of choice for beta-hemolytic Streptococcus ? Penicillin Tetracycline Bacitracin Vancomycin Penicillin 9. Pathogenic M. catarrhalis grows best under which conditions? Anaerobic atmosphere 42°C Increased CO2 25oC Increased CO2 10. Which of the following is a leading cause of fatal bacterial meningitis? B. pertussis M. catarrhalis N. meningitidis N. gonorrhoeae N. meningitidis 11. Biologic false positives may occur in serologic assays for syphilis as a result of: Failure to read the reaction at the correct time point Inactivation of the patient's serum before analysis Failure to bring samples and reagents to room temperature Pathologic conditions, including other infectious diseases Pathologic conditions, including other infectious diseases 12. N. gonorrhoeae can be differentiated from N. meningitidis by: Dextrose fermentation Maltose fermentation Lactose fermentation Nitrate reduction Maltose fermentation 13. Which organism produces the CAMP factor enhancing beta-hemolysis in the presence of the S. aureus beta-lysin? Group A streptococci Group B streptococci Group C streptococci Group D streptococci Group B streptococci 14. Which of the following is acceptable for therapy? Fluoroquinolones Penicillin Cephalosporin Aminoglycosides Fluoroquinolones 15. Which of the following agars should be used for culturing Legionella ? CIN BCYE SMAC XLD BCYE 16. Optochin sensitivity is used to differentiate: S. pneumoniae from other alpha-hemolytic streptococci S. pyogenes from S. pneumoniae S. agalactiae from S. pyogenes Enterococci from non-group D enterococci S. pneumoniae from other alpha-hemolytic streptococci 17. All of the following media used for the cultivation of Micrococcaceae are selective except: 5% sheep blood agar Phenylethyl alcohol agar Mannitol salt agar Colistin nalidixic acid agar 5% sheep blood agar 18. Prokaryotic chromosomes: Are double-stranded RNA molecules Are single-copy, double-stranded DNA molecules Are linear double-stranded DNA molecules Are unable to replicate independently of plasmids Are single-copy, double-stranded DNA molecules 19. Purulent discharge from a newborn with conjunctivitis yields oxidase positive, gram negative diplococci from a subculture to a chocolate agar plate. Biochemical tests provide the following results: glucose utilization= positive maltose utilization= negative lactose utilization= negative sucrose utilization = negative no growth on nutrient agar Growth on Thayer-Martin agar nitrate reduction = negative DNase production = negative This organism is most likely: N. meningitidis N. gonorrhoeae N. mucosa (saprophytica species) Neisseria lactamica Moraxella catarrhalis N. gonorrhoeae 20. Treponema pallidum ss. pertenue is the causative agent of - venereal and congenital syphili