Microbiology MLT Practice
What produces mucoid, pink to red lactose fermenting colonies on MacConkey agar? A). Haemophillus parainfluenzae B). Legionella dumoffii C). Aeromonas hydrophilia D). Klebsiella pneumoniae
Klebsiella pneumoniae
Which of the following describes a sentinel laboratory as part of the Laboratory Response Network (LRN)? A). A laboratory that performs confirmatory testing on possible bioterrorism agents B). A laboratory that performs basic testing to rule out possible bioterrorism agents, and then refers any suspicious agents or specimens to an LRN reference laboratory C). A laboratory that would only identify Category B infectious agents D). A laboratory that only performs environmental testing for possible agents of bioterrorism
A laboratory that performs basic testing to rule out possible bioterrorism agents, and then refers any suspicious agents or specimens to an LRN reference laboratory
An Enterobacteriaceae grows as a clear colony on MacConkey but a salmon-colored colony with a black center on Hektoen enteric agar. Which of the following TSI reactions would match these morphologies? A). Alk/A H2S B). A/A H2S C). Alk/A no H2S D). A/A no H2S
A/A H2S
Which of the following parasites has a life cycle that most closely resembles that of Plasmodium species? A). Dracunculus medinensis B). Blastocystis hominis C). Babesia microti D). Toxoplasma gondii
Babesia microti
Spinal fluid cultures on a 3-day-old infant revealed beta-hemolytic, gram-positive cocci occurring in pairs and chains. The organism was catalase-negative and bile esculin-negative. Resistance to bacitracin was noted. The other test necessary to identify this organism is a positive test by: A). Bile solubility B). CAMP C). Coagulase D). PYR
CAMP
All of the following life stages of schistosome worms are appropriately matched with the host they are found in, EXCEPT: A). Cercaria - cow B). Sporocysts - snail C). Adult worm - human D). Egg - human
Cercaria - cow
Clenched-fist cellulitis is commonly found in patients whom have been in a physical altercation. Which organism below is the most likely cause of this condition? A). Neisseria gonorrhoeae b). Staphylococcus aureus C). Streptococcus anginosus group D). Eikenella corrodens
Eikenella corrodens
The small mass of chromatin located in the nucleus of the amebic parasites is termed: A). Cytostome B). Peripheral chromatin C). Karyosome D). Micronucleus
Karyosome
Parasites of humans are classified into six major divisions. Protozoa is one of those divisions. Which of the following belongs to this classification? A). Flagellates and ciliates B). Amoeba and roundworms C). Coccidia and flatworms D). Microsporidia and mites
Flagellates and ciliates
Blood cultures are collected from a septic patient with a history of chronic urinary tract infections. The sheep blood agar and the chocolate agar grow a creamy colony that has feet like or star like projections from the colony. The Gram stain of the colony demonstrates a budding yeast with pseudohyphae. What would be the next step in identifying the organism? A). Catalase B). Oxidase C). Germ tube D). Spot-indole
Germ tube
The Entero-Test or string test may be helpful in diagnosing an infection with which of the following parasitic organisms? A). Entamoeba coli B). Balantidium coli C). Dientamoeba fragilis D). Giardia duodenalis
Giardia duodenalis
In rapid carbohydrate fermentation testing, Neisseria gonorrhoeae ferments the following sugar(s): A). Glucose only B). Glucose and maltose C). Glucose, maltose, and lactose D). Glucose, maltose, lactose, and sucrose
Glucose only
Each of the following parasites, whose common names are listed, is associated with intestinal infections, EXCEPT: A). Whipworm B). Dwarf tapeworm C). Malayan filarial worm D). Pinworm
Malayan filarial worm
The surface of a blood agar plate after 48 hours, incubated at 37oC, shows colonies with smooth, lemon yellow pigmentation. Note in the image is a Gram stain with relatively large Gram positive cocci arranged in tetrads. Other distinguishing characteristics were the demonstration of susceptibility to bacitracin and resistance to furazolidone. Select the identification of this isolate. A). Staphylococcus aureus B). Staphylococcus epidermidis C). Staphylococcus saprophyticus D). Micrococcus luteus
Micrococcus luteus
Which of the following methods is used to detect the presence of carbapenemase producing organisms? A). D test B). ESBL Test C). Modified Hodge Test D). Beta-lactamase test
Modified Hodge Test
Of the Enterobacteriaceae listed below, which of the following species fails to decarboxylate lysine, ornithine, and arginine? A). Pantoea agglomerans B). Enterobacter aerogenes C). Yersinia enterocolitica D). Proteus mirabilis
Pantoea agglomerans
Which of the following is a common contaminant that first rapidly produces white growth and then becomes powdery, bluish-green growth? The microscopic examination shows spore-bearing hyphae that characteristically form a brush with unbranched conidia arising from sterigmata that are arranged in whorls. A). Rhizopus B). Fusarium C). Aspergillus D). Penicillium
Penicillium
Which malaria pathogen is associated with massive hemolysis, blackwater fever, and blockage of capillaries? A). Plasmodium vivax B). Plasmodium falciparum C). Plasmodium ovale D). Plasmodium malariae
Plasmodium falciparum
Malarial species schizont found inside RBC's with 6 to 12 merozoites? A). Plasmodium vivax schizont B). Plasmodium malariae schizont C). Plasmodium ovale schizont D). Plasmodium falciparum schizont
Plasmodium malariae schizont
Which of the following biochemical reactions is most useful in establishing a definitive identification of Staphylococcus aureus? A). Positive catalase test B). Fermentation of mannitol C). Positive tube coagulase test D). Susceptibility to bacitracin
Positive tube coagulase test
Exudate from a burn submitted on a swab for bacterial culture grew a gram-negative bacillus that was oxidase-positive, produced an alkaline slant and butt on TSIA, was resistant to numerous antibiotics, and produced a green, water-soluble pigment. This organism would be identified as: A). Pseudomonas fluorescens B). Pseudomonas aeruginosa C). Stenotrophomonas maltophilia D). Burkholderia cepacia
Pseudomonas aeruginosa
A day-care outbreak of diarrhea revealed an oxidase-negative, non-lactose fermenting, nonmotile, gram-negative rod. These characteristics presumptively indicate which organism? A). Shigella species B). Salmonella species C). E. coli 0157:H7 D). Campylobacter jejuni
Shigella species
Which statement about assays for the antigenic detection of both Clostridium difficile toxins A and B is TRUE? A). The antigenic assays give rapid results. B). The assays can only detect simultaneous production of toxin A and toxin B. C). The assays provide a high level of sensitivity. D). Assays that detect toxin A alone will detect all clinically significant strains.
The antigenic assays give rapid results.
Which of the following anthropods would be classified as arachnida? A). Ticks B). Fleas C). Lice D). Crabs
Ticks
