Question 1

If a bacteria produces the enzyme tryptophanase to break down the amino acid tryptophan, which of the following tests will be positive with Kovacs reagent?

Options :

A : Basophiles

B : AntiA1 lectin is extracted from the seeds of Dolichos biflorus. This reagent will agglutinate A1 cells, but not A2 cells

C : A qualitative disorder of erythroid, myeloid and/ or megakaryoctic cell series

D : Indole test

Answer: D

Question 2

T lymphocytes

Options :

A : Bone marrow shows foam cells ranging from 20100um in size, vacuolated cytoplasm containing sphingomyelin and is faintly PAS +

B : Cells likely identified in lesions of mycosis fungoides

C : Stain used to differentiate acute myelocytic from acute lymphocytic leukemia

D : Cell series most readily identified by a positive Sudan black B

Answer: B

Question 3

Analysis of CSF for oligoclonal bands is used to screen for ________.

Options :

A : multiple sclerosis

B : multiple myeloma

C : myasthenia gravis

D : von Willebrand disease

Answer: A

Question 4

Chloroacetate

Options :

A : Chemical test for the diagnosis of hairy cell leukemia

B : Substrate used for the detection of specific esterase

C : typically detected in normal myeloid cells, are expressed on the surface of hairy cell leukemia lymphocytes

D : is expressed on neoplastic plasma cells and is useful in the diagnosis of myeloma

Answer: B

Question 5

SPS is used as an anticoagulant for blood cultures because it

Options :

A : Inactivates penicillin and cephalosporins

B : Prevents clumping of red cells

C : Inactivates neutrophils and components of serum complement

D : Facilitates growth of anaerobes

Answer: C

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