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BIO NMDCAT Conjugated molecules
nmdcat.online July 3, 2026

74. The primary structural difference between the A, B, and O blood group antigens lies in the activity of specific enzymes called

A. Proteases that cleave cell receptors
B. Glycosyltransferases that add specific terminal sugar residues
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C. Lipases that hydrolyze membrane fatty acids
D. Kinases that add phosphate groups to membrane proteins

📝 Explanation

Genetic variations dictate which glycosyltransferase is active, determining whether an extra N-acetylgalactosamine (A) or galactose (B) is added.

📖 Additional Information

  • Proteases that cleave cell receptors
  • Glycosyltransferases that add specific terminal sugar residues
  • Lipases that hydrolyze membrane fatty acids
  • Kinases that add phosphate groups to membrane proteins

Genetic variations dictate which glycosyltransferase is active, determining whether an extra N-acetylgalactosamine (A) or galactose (B) is added.

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