BOC Prep 7 Pro Test Questions With Solved Solutions.
6 views 0 purchase
Course
BOC Microbiology
Institution
BOC Microbiology
In a quality control procedure on a new batch of Mueller-Hinton agar plates using a stock culture of S. aureus, all the disk zone sizes are too small. The most likely reason for this is that:
A. potency of the antibiotic disks is too high
B. Mueller-Hinton plates were poured too thin
C. disks...
BOC Prep 7 Pro Test Questions With
Solved Solutions.
In a quality control procedure on a new batch of Mueller-Hinton agar plates using a stock culture of S.
aureus, all the disk zone sizes are too small. The most likely reason for this is that:
A. potency of the antibiotic disks is too high
B. Mueller-Hinton plates were poured too thin
C. disks should have been set up on mannitol salt
D. bacterial suspension was not diluted to the proper concentration - Answer D. bacterial suspension
was not diluted to the proper concentration
Which of the following combinations of organisms would be appropriate as controls to test the functions
listed?
A. beta-hemolysis - negative Escherichia coli and Streptococcus pyogenes
B. indole - negative Escherichia coli and Proteus mirabilis
C. H2S production - negative Proteus mirabilis and Staphylococcus epidermidis
D. catalase - negative Staphylococcus aureus and Staphylococcus epidermidis - Answer B. indole -
negative Escherichia coli and Proteus mirabilis
A urine Gram stain shows gram-positive cocci in clusters. The organism tested catalase positive. To
speciate this organism from culture, the technician should perform a coagulase test and a/an:
A. oxidase
B. beta-lactamase
C. novobiocin susceptibility
D. polymyxin B susceptibility - Answer C. novobiocin susceptibility
,The Gram stain from a blood culture shows gram-positive cocci in chains. No growth occurs on blood
agar plates incubated both aerobically and anaerobically. Additional testing should be done
to detect the presence of:
A. Streptococcus pneumonia
B. Abiotrophia defective
C. Staphylococcus saprophyticus
D. Aerococcus urinae - Answer B. Abiotrophia defective
Viridans streptococci can be differentiated from Streptococcus pneumoniae by:
A. alpha hemolysis
B. catalase reaction
C. morphology
D. bile solubility - Answer D. bile solubility
A reliable test for distinguishing Staphylococcus aureus from other staphylococci is:
A. coagulase
B. catalase
C. optochin susceptibility
D. oxidase - Answer B. catalase
The optochin (ethylhydrocupreine hydrochloride) disk is used for the identification of:
A. Haemophilus influenzae
B. Streptococcus pneumoniae
C. group A beta-hemolytic streptococci
D. alpha-hemolytic streptococci - Answer B. Streptococcus pneumoniae
, In the optochin (ethylhydrocupreine hydrochloride) susceptibility test, if there is a zone of inhibition of
19-30 mm surrounding the disk following overnight incubation at 37"C, the colony most likely consists of:
A. intestinal bacilli
B. pneumococci
C. streptococci
D. staphylococci - Answer B. pneumococci
Which 2 diseases are usually preceded by infection with beta-hemolytic streptococci?
A. rheumatic fever, undulant fever
B. glomerulonephritis, rheumatic fever
C. glomerulonephritis, undulant fever
D. rheumatic fever, tularemia - Answer B. glomerulonephritis, rheumatic fever
The enterotoxin produced by certain strains of hemolytic, coagulase-positive Staphylococcus aureus:
A. is identical to the dermonecrotic toxin
B. is destroyed by boiling for 15-30 minutes
C. causes one type of bacterial food poisoning
D. is highly antigenic - Answer C. causes one type of bacterial food poisoning
A gamma-hemolytic Streptococcus that blackens bile esculin agar but does not grow in 6.5% NaCl broth
is most likely:
A. Enterococcus
B. group D Streptococcus
C. group B Streptococcus
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller COCOSOLUTIONS. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.09. You're not tied to anything after your purchase.
