1.

Antibodies (agglutinins) of the A and B red cell antigens (agglutinogens) A. Are present in fetal plasma. B. Cause haemolysis of RBCs containing the A and B antigens when added to a suspension of red cells in saline. C. Do not normally cross the placental barrier. D. Have a molecular weight in excess of 500 000. E. Are monovalent.

Answer»

A. False They form shortly after birth, possibly in response to A and B antigens carried into the body by invading bacteria. 

B. False They cause agglutination (clumping) of A, B and AB cells. 

C. True Unlike Rh antibodies which have a smaller molecular size.

D. True Around 1000000. 

E. False They are divalent and hence cause red cells to adhere to one another during agglutination.



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