Online Access Free AmericanSocietyofMicrobiology.ABMM.v2025-10-15.q70 Practice Test (Page 3)

ABMM Exam Question 6

A patient with a history of intravenous drug use develops a bloodstream infection with Staphylococcus aureus. Antimicrobial susceptibility testing reveals resistance to methicillin. The mechanism of methicillin resistance in Staphylococcus aureus is primarily mediated by:

A.Alteration of penicillin-binding proteins (PBPs).

B.Increased expression of efflux pumps.

C.Production of beta-lactamase enzymes.

D.Acquisition of genes encoding aminoglycoside-modifying enzymes.

ABMM Exam Question 7

A clinical microbiology laboratory is performing quality control on Gram stain reagents. A control slide containing Escherichia coli and Staphylococcus aureus shows both organisms staining purple after the complete staining procedure. The MOST likely cause of this error is:

A.Insufficient washing after crystal violet.

B.Omission of the iodine mordant.

C.Over-decolorization with alcohol-acetone.

D.Insufficient application of crystal violet.

ABMM Exam Question 8

The human virome, the collection of viruses that reside in and on the human body, is increasinglyrecognized for its role in health and disease. Which of the following statements regarding the human virome is MOST accurate?

A.Bacteriophages, viruses that infect bacteria, are a significant component of the human gut virome.

B.The human virome is primarily composed of pathogenic viruses that cause acute infections.

C.The composition of the human virome is relatively stable over time and is not influenced by environmental factors.

D.The human virome is largely independent of the host's immune status.

ABMM Exam Question 9

Microscopic examination of a potassium hydroxide (KOH) preparation of skin scrapings from a patient with tinea versicolor typically reveals:

A.Septate hyphae and arthroconidia

B.Cigar-shaped yeast cells

C.Short, unbranched hyphae and globose yeast cells in clusters ("spaghetti and meatballs")

D.Broad, aseptate hyphae with sporangiophores

ABMM Exam Question 10

A microbiology laboratory is performing antimicrobial susceptibility testing using Etest strips. The MIC value is determined by:

A.The highest concentration that allows visible bacterial growth within the zone of inhibition.

B.The diameter of the zone of inhibition around the strip.

C.The presence or absence of growth at a single critical concentration.

D.The lowest concentration at which the elliptical zone of inhibition intersects the strip.

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