Multiple choice

Which blood group lacks antigen on the surface of the red blood cells?

  1. Blood group A

  2. Blood group B

  3. Blood group AB

  4. Blood group O

  5. Rh group
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood group O individuals do not have either A or B antigens on the surface of their RBCs. But their blood serum contains IgM anti-A and anti-B antibodies against the A and B blood group antigens. Therefore, an individual of blood group O can receive blood only from a group O individual, but can donate blood to individuals of any ABO blood group (i.e. A, B, O or AB). They are known as universal donors.

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