Question

Blood group A has the following:

• A. A antigens on red blood cells and anti-B antibodies in the plasma
• B. B antigens on red blood cells and anti-A antibodies in the plasma
• C. Both A and B antigens on red blood cells
• D. Both anti-A and anti-B antibodies in the plasma

Hint:

ABO system: A = A antigen + anti-B, B = B antigen + anti-A, AB = A + B antigens (no antibodies), O = no antigens + anti-A and anti-B.

Answer 1

The Correct Option is A

Step 1: Recall ABO blood group system.
Blood groups are determined by antigens present on red blood cells (RBCs) and corresponding antibodies in plasma.
Step 2: Characteristics of Group A.
- RBCs have A antigens on their surface.
- Plasma contains anti-B antibodies.
This ensures that if Group A blood is exposed to B antigens, agglutination occurs.
Step 3: Exclude other options.
- (B) Describes Group B, not A.
- (C) Describes Group AB.
- (D) Describes Group O.
Step 4: Conclusion.
Thus, Blood group A = A antigens on RBCs + anti-B antibodies in plasma.