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The ABO blood types are classified according to the carbohydrate antigens on the

ID: 976058 • Letter: T

Question

The ABO blood types are classified according to the carbohydrate antigens on the glycoproteins glycolipids on the red blood cells. Explain why O type blood is compatible to all blood types (A, AB, B and O) for blood transfusion. Proteins (polymers of amino acids connected by peptide bonds) can spontaneously fold or self- assemble into well-defined 2D and 3D structures with atomic precision in water (the milieu of the cells). What are the three types of secondary structures found in proteins? Is the interior of the protein expected to be hydrophilic or hydrophobic?

Explanation / Answer

(A) Because

Blood group O individuals don not have either A or B antigens on the surface of their RBCs and their serum contains lgM anti-A and anti-B antibodies.

(B) (a) Alpha helix

Beta sheets

Coils

(b) Hydrophobic