A person with blood group AB is called a universal recipient because their plasma contains
Correct answer: A. neither anti A nor anti B antibodies
- A. neither anti A nor anti B antibodies
- B. both anti A and anti B antibodies
- C. only anti A antibodies
- D. no red cell antigens
Explanation
With A and B antigens on their own cells, AB individuals make no antibodies against either, so they can receive cells of any group. Universal donors, group O, sit at the opposite end of the logic.
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Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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