lOMoARcPSD|50131128
Micro exam bank - Please send me
Financial Modeling (Wolaita Sodo University)
, lOMoARcPSD|50131128
1. You’re in the clinical laboratory looking at a Gram stain when the laboratory technician comes
up to you and says, “I think your patient has Staphylococcus epidermidis bacteremia.”Which one
of the following sets of results did the tech find with the organism recovered from the blood
culture?
A. Gram-positive cocci in chains, catalase-positive, coagulase-positive
B. Gram-positive cocci in chains, catalase-negative, coagulase-negative
C. Gram-positive cocci in clusters, catalase-positive, coagulase-negative
D. Gram-positive cocci in clusters, catalase-negative, coagulase-positive
E. Gram-positive diplococci, catalase-negative, coagulase-positive
2. Superantigen production by Staphylococcus aureus is involved in the pathogenesis of which
one of the following diseases?
(A) Impetigo
(B) Osteomyelitis
(C) Scalded skin syndrome
(D) Septicemia
(E) Toxic shock syndrome
3. A pore-forming exotoxin produced by Staphylococcus aureus that kills cells and is important
in the severe, rapidly spreading necrotizing lesions caused by MRSA strains is:
(A) coagulase.
(B) enterotoxin.
(C) exfoliatin.
(D) P-V leukocidin.
(E) staphyloxanthin.
4. An outbreak of serious pneumococcal pneumonia and sepsis among inmates in an
overcrowded prison has occurred. Laboratory analysis determined that one serotype was
involved. The prison physician said that the pneumococcal vaccine might have limited
The outbreak. Which one of the following structures of the pneumococcus is responsible for
determining the serotype and is also the immunogen in the vaccine?
(A) Capsule
(B) Flagellar protein
(C) O antigen
(D) Peptidoglycan
(E) Pilus protein
5. Which one of following laboratory tests is the most appropriate to distinguish Streptococcus
pyogenes from other β-hemolytic streptococci?
(A) Ability to grow in 6.5% NaCl
(B) Activation of C-reactive protein
(C) Hydrolysis of esculin in the presence of bile
(D) Inhibition by bacitracin
(E) Inhibition by optochin
6. Your patient in the emergency room has a 5-cm ulcer on her leg that is surrounded by a red,
warm, and tender area of inflammation. You do a Gram stain on pus from the ulcer and see
gram-positive cocci in chains. Culture of the pus grows small β-hemolytic colonies that are
catalase-negative and are inhibited by bacitracin. These results indicate that the organism causing
her lesion is most likely:
(A) Enterococcus faecalis.
Micro exam bank - Please send me
Financial Modeling (Wolaita Sodo University)
, lOMoARcPSD|50131128
1. You’re in the clinical laboratory looking at a Gram stain when the laboratory technician comes
up to you and says, “I think your patient has Staphylococcus epidermidis bacteremia.”Which one
of the following sets of results did the tech find with the organism recovered from the blood
culture?
A. Gram-positive cocci in chains, catalase-positive, coagulase-positive
B. Gram-positive cocci in chains, catalase-negative, coagulase-negative
C. Gram-positive cocci in clusters, catalase-positive, coagulase-negative
D. Gram-positive cocci in clusters, catalase-negative, coagulase-positive
E. Gram-positive diplococci, catalase-negative, coagulase-positive
2. Superantigen production by Staphylococcus aureus is involved in the pathogenesis of which
one of the following diseases?
(A) Impetigo
(B) Osteomyelitis
(C) Scalded skin syndrome
(D) Septicemia
(E) Toxic shock syndrome
3. A pore-forming exotoxin produced by Staphylococcus aureus that kills cells and is important
in the severe, rapidly spreading necrotizing lesions caused by MRSA strains is:
(A) coagulase.
(B) enterotoxin.
(C) exfoliatin.
(D) P-V leukocidin.
(E) staphyloxanthin.
4. An outbreak of serious pneumococcal pneumonia and sepsis among inmates in an
overcrowded prison has occurred. Laboratory analysis determined that one serotype was
involved. The prison physician said that the pneumococcal vaccine might have limited
The outbreak. Which one of the following structures of the pneumococcus is responsible for
determining the serotype and is also the immunogen in the vaccine?
(A) Capsule
(B) Flagellar protein
(C) O antigen
(D) Peptidoglycan
(E) Pilus protein
5. Which one of following laboratory tests is the most appropriate to distinguish Streptococcus
pyogenes from other β-hemolytic streptococci?
(A) Ability to grow in 6.5% NaCl
(B) Activation of C-reactive protein
(C) Hydrolysis of esculin in the presence of bile
(D) Inhibition by bacitracin
(E) Inhibition by optochin
6. Your patient in the emergency room has a 5-cm ulcer on her leg that is surrounded by a red,
warm, and tender area of inflammation. You do a Gram stain on pus from the ulcer and see
gram-positive cocci in chains. Culture of the pus grows small β-hemolytic colonies that are
catalase-negative and are inhibited by bacitracin. These results indicate that the organism causing
her lesion is most likely:
(A) Enterococcus faecalis.
