BOC Microbiology Revision Exam
Questions With Verified Solutions.
d (aseptically puncture the tubing) - Answer 2. The most appropriate method for collecting a urine
specimen from a patient with an indwelling catheter is:
a. remove the catheter, cut the tip, and submit it for culture
b. disconnect the catheter from the bag, and aseptically collect urine from the terminal end of the
catheter
c. aseptically collect urine directly from the drainage bag
d. aspirate the urine aseptically from the catheter tubing
b - Answer 6. The most important variable in the recovery or organisms in adult patients with
bacteremia is:
a. subculture of all bottles at day 5 incubation
b. the recommended volume of blood cultured
c. collection of daily blood culture sets for 3 consecutive days
d. collection of multiple blood culture sets from a single venipuncutre
d (renal tuberculosis) - Answer 14. Which of the following specimen requests is acceptable?
a. feces submitted for anaerobic culture
b. Foley catheter tip submitted for aerobic culture
c. rectal swab submitted for direct smear for gonooccci
d. urine culture of acid-fast bacilli
c - Answer 15. A CSF specimen containing only 2 drops of CSF was collected by a lumbar puncture from
a febrile 25 year old male and was reported as many neutrophils and no microorganisms seen. The
remaining drop of CSF should be inoculated to:
a. blood agar
b. CNA agar
,c. chocolate agar
d. Thayer-Martin agar
d (CID is selective and differential for this organism) - Answer 18. Which of the following is the most
appropriate organism and media combination?
a. Vibrio species - Skirrow
b. Enterohemorrhagic E coli - PEA
c. Campylobacter species - charcoal yeast extract
d. Yersinia enterocolitica - CIN
b (BCYE has cystine) - Answer 24. A medium that can be used to recover Francisella tularensis is
a. Bordet-Gengou agar
b. Buffered charcoal yeast extract agar
c. Loeffler agar
d. MacConkey agar
c - Answer 26. An antibiotic used to suppress or kill contaminating fungi in media is
a. amphotericin B penicillin
b. chlorampnehicol
c. cycloheximide
d. streptomycin
b - Answer 28. A vaginal/rectal swab is collected from a pregnant patient to screen for GBS. The best
medium to inoculate the specimen to is:
a. CNA agar
b. LIM broth
c. sheep blood agar
d. thioglycollate broth
, c - Answer 32. Anticoagulants acceptable for use with blood, bone marrow, and synovial fluid
specimens that are to be cultured include
a. EDTA and sodium citrate
b. heparin and sodium citrate
c. SPS and heparin
d. SPS and EDTA
c - Answer 36. In general, anaerobic infections differ from aerobic infections in which one of the
following?
a. they usually respond favorably to aminoglycoside therapy
b. they usually arise from exogenous sources
c. they are usually polymicrobic
d. Gram stains of specimens are less helpful in diagnosis
a - Answer 41. Relapsing fever in humans is caused by
a. Borrelia recurrentis
b. Brucella abortus
c. Leptospira interrogans
d. Spirillum minus
c - Answer 48. A GPC isolated from a blood culture has the following characteristics
-Optochin susceptibility: neg
-Bacitracin susceptibility: neg
-Bile esculin hydrolysis: neg
-Hippurate hydrolysis: pos
-Catalase: neg
This organism is most likely
a. Staphylococcus aureus
b. Streptococcus pneumoniae
Questions With Verified Solutions.
d (aseptically puncture the tubing) - Answer 2. The most appropriate method for collecting a urine
specimen from a patient with an indwelling catheter is:
a. remove the catheter, cut the tip, and submit it for culture
b. disconnect the catheter from the bag, and aseptically collect urine from the terminal end of the
catheter
c. aseptically collect urine directly from the drainage bag
d. aspirate the urine aseptically from the catheter tubing
b - Answer 6. The most important variable in the recovery or organisms in adult patients with
bacteremia is:
a. subculture of all bottles at day 5 incubation
b. the recommended volume of blood cultured
c. collection of daily blood culture sets for 3 consecutive days
d. collection of multiple blood culture sets from a single venipuncutre
d (renal tuberculosis) - Answer 14. Which of the following specimen requests is acceptable?
a. feces submitted for anaerobic culture
b. Foley catheter tip submitted for aerobic culture
c. rectal swab submitted for direct smear for gonooccci
d. urine culture of acid-fast bacilli
c - Answer 15. A CSF specimen containing only 2 drops of CSF was collected by a lumbar puncture from
a febrile 25 year old male and was reported as many neutrophils and no microorganisms seen. The
remaining drop of CSF should be inoculated to:
a. blood agar
b. CNA agar
,c. chocolate agar
d. Thayer-Martin agar
d (CID is selective and differential for this organism) - Answer 18. Which of the following is the most
appropriate organism and media combination?
a. Vibrio species - Skirrow
b. Enterohemorrhagic E coli - PEA
c. Campylobacter species - charcoal yeast extract
d. Yersinia enterocolitica - CIN
b (BCYE has cystine) - Answer 24. A medium that can be used to recover Francisella tularensis is
a. Bordet-Gengou agar
b. Buffered charcoal yeast extract agar
c. Loeffler agar
d. MacConkey agar
c - Answer 26. An antibiotic used to suppress or kill contaminating fungi in media is
a. amphotericin B penicillin
b. chlorampnehicol
c. cycloheximide
d. streptomycin
b - Answer 28. A vaginal/rectal swab is collected from a pregnant patient to screen for GBS. The best
medium to inoculate the specimen to is:
a. CNA agar
b. LIM broth
c. sheep blood agar
d. thioglycollate broth
, c - Answer 32. Anticoagulants acceptable for use with blood, bone marrow, and synovial fluid
specimens that are to be cultured include
a. EDTA and sodium citrate
b. heparin and sodium citrate
c. SPS and heparin
d. SPS and EDTA
c - Answer 36. In general, anaerobic infections differ from aerobic infections in which one of the
following?
a. they usually respond favorably to aminoglycoside therapy
b. they usually arise from exogenous sources
c. they are usually polymicrobic
d. Gram stains of specimens are less helpful in diagnosis
a - Answer 41. Relapsing fever in humans is caused by
a. Borrelia recurrentis
b. Brucella abortus
c. Leptospira interrogans
d. Spirillum minus
c - Answer 48. A GPC isolated from a blood culture has the following characteristics
-Optochin susceptibility: neg
-Bacitracin susceptibility: neg
-Bile esculin hydrolysis: neg
-Hippurate hydrolysis: pos
-Catalase: neg
This organism is most likely
a. Staphylococcus aureus
b. Streptococcus pneumoniae
