ASCP ASCP-MLT Online Practice Questions and Exam Preparation

ASCP ASCP-MLT Online Questions & Answers

• Question 251:

  A zone of inhibition is the area around an antibiotic-infused paper disk that does not show any bacterial growth. The antibiotic impregnated on the disk will diffuse into the agar in the area surrounding the disk. If the bacteria are sensitive to the antibiotic, they cannot grow near the disk. The size of the zone is proportional to how sensitive the organism is. If the organism is resistant to the antibiotic, it will grow very closely to the disk.

  The size of the zone of suppressed growth on a sensitivity plate using sensitivity disks is referred to as the zone of:

  A. beta hemolysis
  B. alpha hemolysis
  C. gamma hemolysis
  D. inhibition
  E. susceptibility
  D. inhibition

• Question 252:

  Considering the reactions given in this case study, Yersinia enterocolitica would be the best choice. Most strains of Plesiomonas shigelloides, Escherichia coli, and Pasteurella multocida are urease negative. Also, Plesiomonas shigelloides demonstrates a K/A reaction on a TSI slant. The stool specimen from a patient admitted to the hospital with symptoms of appendicitis has a culture with the following characteristics: Gram-negative bacillus Catalase positive Urease positive Weakly fermentative TSI Slant is A/A These reactions suggest that the organism is MOST likely:

  A. Yersinia enterocolitica
  B. Escherichia coli
  C. Plesiomonas shigelloides
  D. Pasteurella multocida
  A. Yersinia enterocolitica

• Question 253:

  The colonies seen growing on the bird seed agar appear smooth and have a distinct reddish-brown pigmentation. The active ingredient in bird seed (Guizotia abyssinica) agar is caffeic acid, which is extracted and placed in an agar containing

  1% glucose. Of the cryptococci, and other species of yeasts, Cryptococcus neoformans selectively produces the enzyme phenoloxidase, which oxidizes the caffeic acid in the medium to melanin, producing the red-brown pigmentation.

  The other yeast species included in this exercise do not possess phenoloxidase activity and therefore remain non-pigmented when grown on bird seed agar.

  The colonies shown in this photograph were grown on Guizotia abyssinica (bird seed) agar at 30°C for 72 hours. The most likely identification is:

  

  A. Cryptococcus laurentii
  B. Cryptococcus neoformans
  C. Candida parapsilosis
  D. Saccharomyces cerevisiae
  B. Cryptococcus neoformans

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  Explanation/Reference:

• Question 254:

  The presence of hyaline, septate hyphae, and a young conidiophore with a foot cell and a swollen vesicle in a fungus culture are excellent clues indicative of Aspergillus. Aspergillus has the ability to infect primarily immunocompromised hosts, and causes pneumonia and/or disseminates to other organs. Clinical specimens should be inoculated onto primary isolation media, such as Sabouraud's dextrose agar. Aspergillus spp. are fast growing and can be white, yellow, yellow-brown, brown to black or green in color.

  The presence of hyaline, septate hyphae, and a young conidiophore with a foot cell and a swollen vesicle in a fungus culture are excellent clues indicative of:

  A. Acremonium
  B. Aspergillus
  C. Paecilomyces
  D. Penicillium
  E. Scopulariopsis
  B. Aspergillus

• Question 255:

  Any oxidase-positive organism can be excluded from the Enterobacteriaceae. The other characteristics are as a rule present in these organisms.

  Which of the following is not true about members of the Enterobacteriaceae:

  A. Gram-negative
  B. Oxidase positive
  C. Reduce nitrate to nitrite
  D. Ferment glucose
  B. Oxidase positive

• Question 256:

  Certain recipients have increased risk for developing TA-GVHD. They are: Neonates less than 4 months of age Fetuses Recipients with a congenital or acquired immunodeficiency, such as bone marrow or stem cell recipients, and patients receiving chemotherapy recipients of donor units from a blood relative Which of the following patients are at risk for transfusion-associated graft versus host disease (TA-GVHD) and require irradiated cellular blood products? (Choose all that apply)

  A. Neonates less than 4 months of age
  B. Recipients of donor units known to be from a blood relative.
  C. Patients with chronic anemias.
  D. Patient receiving chemotherapy who are immunocompromised.
  E. Patients with a history of allergic reactions.
  A. Neonates less than 4 months of age
  B. Recipients of donor units known to be from a blood relative.
  D. Patient receiving chemotherapy who are immunocompromised.

• Question 257:

  Anti-A, anti-P, anti-Leb, and anti-M all react best at 4o C as they are predominantly IgM antibodies. Other antibody group choices above include IgG antibodies such as anti-K, anti-s, anti-S, and anti-Fya, anti-Lub, etc. which react best at 37o

  A. Anti-A, Anti-P1 , Anti-Leb , Anti-M
  B. Anti-B, Anti-K, Anti-Lua , Anti-Fya
  C. Anti-H, Anti-S, Anti-Jkb , Anti-Leb
  D. Anti-A, Anti-K, Anti-Lub , Anti-s
  A. Anti-A, Anti-P1 , Anti-Leb , Anti-M

• Question 258:

  Hepatitis B surface antigen, or HBs, is a protein that is present on the surface of the virus. The protein will be present via laboratory testing in the blood with acute and chronic HBV infections Immunology What sero-marker is the first marker to become positive in Hepatitis B and is associated with the infective stage?

  A. HBc antibody
  B. HBc total
  C. HBs antigen
  D. Hbs antibody
  E. Hbe antigen
  C. HBs antigen

• Question 259:

  Match each of the following definitions associated with heart disease and heart failure to the term that it defines.

  1.

  Congestive heart failure

  2.

  Infarction

  3.

  Ischemia

  4.

  Angina

  A. An inadequate blood supply that decreases availability of oxygen.
  B. Chest pain caused by inadequate supply of oxygen to heart myocardium.
  C. An area of tissue death that occurs due to lack of oxygen.
  D. A left ventricular dysfunction resulting from aging, hypertension, atherosclerosis or muscle damage from an AMI or repeated AMIs.
  A. An inadequate blood supply that decreases availability of oxygen.
  B. Chest pain caused by inadequate supply of oxygen to heart myocardium.
  C. An area of tissue death that occurs due to lack of oxygen.
  D. A left ventricular dysfunction resulting from aging, hypertension, atherosclerosis or muscle damage from an AMI or repeated AMIs.

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  Explanation/Reference:

• Question 260:

  Enterococcus spp. are bile esculin positive and grow in 6.5% NaCl. If they grow on the 6 A. Enterococcus spp., Susceptible to vancomycin
  B. Streptococcus Group D, not Enterococcus
  C. Staphylococcus epidermidis, Resistant to vancomycin
  D. Enterococcus spp., Resistant to vancomycin

  D. Enterococcus spp., Resistant to vancomycin