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MDCAT Biology QUESTION #7743
Question 1

Which blood group contains both anti-A and anti-B antibodies in the serum?

  • A
  • AB
  • B
  • O✔️
Correct Answer Explanation

Blood group O has no A or B antigens on RBCs, but both anti-A and anti-B antibodies in plasma. Group A has anti-B; group B has anti-A; group AB has no antibodies.