Practice Quiz in Hematology1

What is the purpose of methemoglobin reductase in RBCs?

• To keep iron in ferrous state

• To synthesize 2,3 DPG

• To maintain alpha and beta chains

• To maintain an anaerobic pathway of glycolysis

What is the purpose of Rapoport leubering shunt in RBCs?

• To keep iron in ferrous state

• To synthesize 2,3 DPG

• To maintain alpha and beta chains

• To maintain an anaerobic pathway of glycolysis

What product is formed when ferrous iron of normal hemoglobin is oxidized to the ferric state?

• Methemoglobin

• Carboxyhemoglobin

• Cyanmethemoglobin

• Sulfhemoglobin

Which of the following hemoglobins could be present in normal adult?

• Hb A₁

• Hb A₂

• HbF

• All of the choices

Which of the following hemoglobins is the most abundant among newborns?

• Hb A₁

• Hb A₂

• HbF

• All of the choices

In the tube solubility test for Hemoglobin S the reagent responsible for the reduction of the hemoglobin molecule is:

• Potassium phosphate

• Sodium dithionate

• Saponin

• Drabkin's reagent

Which of the following hemoglobin is insoluble under lowered oxygen tension?

• HbA₁

• HbS

• HbF

• HbC

How would you describe the tonicity of WBC diluents in WBC counting?

• Isotonic

• Hypertonic

• Hypotonic

• Acidic

Hematocrit is a mesure of:

• RBC sedimentation rate

• Total RBC mass

• Total RBC

• Packed RBC volume

What is the normal value of reticulocytes in a normal adult?

• 1-1.5%

• 5%

• 3-5%

• It absent in the peripheral circulation in normal states