Medical Technologist Test Microbiology 2

Question 1

Which test detects the presence of bacterial DNA replication inhibition by an antibiotic?

Accepted Answer

Broth microdilution MIC

Answer

Broth microdilution determines the minimum inhibitory concentration (MIC), quantifying the lowest drug concentration that inhibits visible bacterial growth.

Question 2

India ink preparation is used to detect which fungal pathogen in CSF?

Accepted Answer

Cryptococcus neoformans

Answer

India ink reveals the large polysaccharide capsule of Cryptococcus neoformans as a clear halo against a black background in CSF.

Question 3

Gram-positive cocci in clusters that are catalase-positive and coagulase-negative are MOST likely which genus?

Accepted Answer

Staphylococcus epidermidis group

Answer

Coagulase-negative staphylococci (CoNS) like S. epidermidis are gram-positive cocci in clusters that are catalase-positive but coagulase-negative.

Question 4

CAMP test positivity is used to identify which pathogen?

Accepted Answer

Streptococcus agalactiae (Group B Strep)

Answer

Group B Streptococcus produces CAMP factor that enhances beta-lysin activity of S. aureus, creating an arrowhead hemolysis pattern.

Question 5

Antigenic variation is a major virulence mechanism of which sexually transmitted pathogen?

Accepted Answer

Neisseria gonorrhoeae

Answer

N. gonorrhoeae undergoes pilin antigenic variation, allowing it to evade the immune response and colonize mucosal surfaces persistently.

Medical Technologist Test Practice Test

Medical Technologist Test Practice Test

Medical Technologist Test Microbiology 2