CSS - PMS - CCE - PCS - General Science
Blood System
Rh-positive blood means that red cells possess the:
A. D antigen
B. A antigen only
C. B antigen only
D. H antigen only
Correct Answer: A
Rh-positive status is chiefly determined by presence of the D antigen.
CSS - PMS - CCE - PCS - General Science
Blood System
If red cells do not agglutinate with either anti-A or anti-B reagent, the ABO group is:
A. A
B. B
C. AB
D. O
Correct Answer: D
Absence of both A and B antigens corresponds to group O.
CSS - PMS - CCE - PCS - General Science
Blood System
If red cells agglutinate with both anti-A and anti-B reagents, the ABO group is:
A. O
B. A
C. B
D. AB
Correct Answer: D
Agglutination with both reagents shows that both A and B antigens are present.
CSS - PMS - CCE - PCS - General Science
Blood System
If red cells agglutinate with anti-A but not anti-B reagent, the ABO group is:
A. A
B. B
C. AB
D. O
Correct Answer: A
Reaction with anti-A alone indicates A antigen is present and B antigen is absent.
CSS - PMS - CCE - PCS - General Science
Blood System
In routine blood grouping, anti-A serum agglutinates cells that possess:
A. A antigen
B. B antigen only
C. Rh antigen only
D. No surface antigen
Correct Answer: A
Anti-A reagent agglutinates red blood cells carrying A antigen.
CSS - PMS - CCE - PCS - General Science
Blood System
Agglutination in an incompatible ABO transfusion results from interaction between:
A. Antigen and corresponding antibody
B. Hemoglobin and oxygen
C. Albumin and sodium
D. Platelets and bilirubin
Correct Answer: A
Antibodies bind corresponding red-cell antigens, causing agglutination and potentially hemolysis.
CSS - PMS - CCE - PCS - General Science
Blood System
ABO blood group antigens are located mainly on the:
A. Red cell membrane
B. Plasma albumin molecule
C. Platelet nucleus
D. Serum fibrin strands
Correct Answer: A
ABO antigens are carbohydrate structures expressed on the surface of red blood cells and other cells.
CSS - PMS - CCE - PCS - General Science
Blood System
A person with blood group AB normally has:
A. Anti-A only
B. Anti-B only
C. Both anti-A and anti-B
D. Neither anti-A nor anti-B
Correct Answer: D
Group AB individuals normally lack anti-A and anti-B antibodies.
CSS - PMS - CCE - PCS - General Science
Blood System
A person with blood group O normally has:
A. Neither anti-A nor anti-B
B. Anti-A only
C. Anti-B only
D. Both anti-A and anti-B
Correct Answer: D
Group O individuals typically have both anti-A and anti-B antibodies in plasma.
CSS - PMS - CCE - PCS - General Science
Blood System
A person with blood group B normally has which antibody in plasma?
A. Anti-A
B. Anti-B
C. Neither
D. Anti-D only
Correct Answer: A
Group B individuals normally have anti-A antibodies in plasma.
CSS - PMS - CCE - PCS - General Science
Blood System
A person with blood group A normally has which antibody in plasma?
A. Anti-A
B. Anti-B
C. Both anti-A and anti-B
D. Neither
Correct Answer: B
Group A individuals normally have anti-B antibodies in plasma.
CSS - PMS - CCE - PCS - General Science
Blood System
Blood group O red cells generally carry:
A. A antigen only
B. B antigen only
C. Both A and B antigens
D. Neither A nor B antigen
Correct Answer: D
Group O red cells lack both A and B antigens.
CSS - PMS - CCE - PCS - General Science
Blood System
Blood group AB red cells carry:
A. Only A antigen
B. Only B antigen
C. Both A and B antigens
D. Neither A nor B antigen
Correct Answer: C
AB red cells express both A and B antigens.
CSS - PMS - CCE - PCS - General Science
Blood System
In the ABO system, blood group B red cells carry:
A. A antigen
B. B antigen
C. Both antigens
D. No ABO antigen
Correct Answer: B
Group B red blood cells express B antigen.
CSS - PMS - CCE - PCS - General Science
Blood System
In the ABO system, blood group A red cells carry:
A. A antigen
B. B antigen
C. Both A and B antigens
D. Neither A nor B antigen
Correct Answer: A
Group A red blood cells express A antigen on their surface.
CSS - PMS - CCE - PCS - General Science
Blood System
The enzyme chiefly responsible for breaking down fibrin is:
A. Pepsin
B. Plasmin
C. Thrombin
D. Amylase
Correct Answer: B
Plasmin digests fibrin during fibrinolysis.
CSS - PMS - CCE - PCS - General Science
Blood System
The process that dissolves a fibrin clot after healing is called:
A. Fibrinolysis
B. Erythropoiesis
C. Agglutination
D. Chemotaxis
Correct Answer: A
Fibrinolysis removes fibrin clots, principally through the action of plasmin.
CSS - PMS - CCE - PCS - General Science
Blood System
Calcium ions are important in:
A. Several steps of the coagulation cascade
B. Oxygen binding to hemoglobin only
C. Bilirubin excretion only
D. Antibody specificity
Correct Answer: A
Calcium acts as an essential cofactor in multiple coagulation reactions.
CSS - PMS - CCE - PCS - General Science
Blood System
Thrombin converts:
A. Fibrin into fibrinogen
B. Fibrinogen into fibrin
C. Hemoglobin into heme
D. Albumin into globulin
Correct Answer: B
Thrombin cleaves soluble fibrinogen into fibrin strands.
CSS - PMS - CCE - PCS - General Science
Blood System
The inactive plasma protein converted into thrombin during coagulation is:
A. Prothrombin
B. Albumin
C. Plasmin
D. Hemoglobin
Correct Answer: A
Prothrombin is converted to thrombin during the coagulation cascade.