Question

An individual of blood group A has

• A. Antigen A in the RBCs and anti- B antibodies in plasma
• B. Antigen B in the RBCs and anti- A antibodies in plasma
• C. Antigen A in the plasma and anti- B antibodies in RBCs
• D. Antigen A and anti- B antibodies in RBCs

Answer 1

Answer: (A)

Antigen A in the RBCs and anti- B antibodies in plasma

There are two antigens and two antibodies that are mostly responsible for the ABO types. The specific combination of these four components determines an individual's type in most cases. For example, people with type A blood will have the A antigen on the surface of their red cells. As a result, anti- A antibodies will not be produced by them because they would cause the destruction of their own blood. However, if B type blood is injected into their systems, anti- B antibodies in their plasma will recognize it as alien and burst or agglutinate the introduced red cells in order to cleanse the blood of alien protein. So, A blood group has anti- B antibodies and B blood group have anti- A antibodies.

Therefore, the correct answer is option A.