Question

the antibodies related to the abo blood group are located
multiple choice
on the red blood cell membrane.
within the plasma.
within the red blood cell nucleus.
within the red blood cell cytosol.

Explanation:

ABO blood group antigens are on red blood cell membranes, while the corresponding antibodies are naturally occurring in the blood plasma, the liquid component of blood, to react with foreign blood antigens if introduced.

Answer:

within the plasma.