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: ABO Blood Group System Overview.
Blood types are defined by the presence of antigens on red blood cells (RBCs) and their corresponding antibodies in the plasma.

Step 2: Group A Blood Characteristics.
- Red blood cells (RBCs) exhibit A antigens on their surface.
- Plasma contains anti-B antibodies.
This composition prevents agglutination if Group A blood encounters B antigens.

Step 3: Elimination of Alternative Groups.
- Option (B) corresponds to Group B, not Group A.
- Option (C) represents Group AB.
- Option (D) describes Group O.

Step 4: Final Determination.
Consequently, Blood group A is characterized by A antigens on RBCs combined with anti-B antibodies in the plasma.