AP BIOLOGY

Detailed explanation-1: -blood group O – has no antigens, but both anti-A and anti-B antibodies in the plasma. blood group AB – has both A and B antigens, but no antibodies.

Detailed explanation-2: -The O antigen is an extremely variable surface polysaccharide of Gram-negative bacteria. This variation is thought to allow the various clones of a species each to present a surface that offers a selective advantage in the niche occupied by that clone.

Detailed explanation-3: -O blood group is the only blood group does not have any type of antigen on their RBCs unless it’s O +ve which means it contains D/Rh factor. There is no antigen known as O but the blood has A, B and D/Rh factor as antigens.

Detailed explanation-4: -Group O can donate red blood cells to anybody. It’s the universal donor. Group AB can donate to other AB’s but can receive from all others.

Detailed explanation-5: -O negative is the universal blood type. O negative blood type can only receive O negative blood. O negative donors who are CMV negative are known as Heroes for Babies at the Red Cross because it is the safest blood for transfusions for immune deficient newborns.