For each of the descriptions in questions 1-5, choose the blood group antigen (A-E) that best matches it
A. A
B. B
C. O
D. RhD
E. Lewis
Formed by a glycosyltransferase enzyme that adds a terminal N-acetylgalactosamine residue to the H antigen
ANS: A. The ABO blood group system includes glycosphingolipid antigens whose synthesis requires the action of glycosyltransferase enzymes. A glycosyltransferase encoded by a gene on chromosome 9 modifies the common H antigen. The A allele of this gene adds a terminal N-acetylgalactosamine residue to the H antigen to form the A antigen.
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