If You Transfuse Type AB Blood into a Patient with Type

question 33

Multiple Choice

If you transfuse type AB blood into a patient with type A blood,the patient will raise antibodies against the B antigen on the donor's blood,but will not raise antibodies against the A antigen.Why not?

• A) B and T cells that recognize the A antigen will have been removed by clonal deletion.
• B) Antibodies that recognize the A antigen will have been removed by the spleen.
• C) Antibodies that recognize the A antigen will have been removed by the bone marrow.
• D) Macrophages will not present the A antigen to T cells.
• E) Recombination of the gene for antibodies cannot produce self-reactive clones.

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A type of retirement plan that promises a specified monthly benefit at retirement, which can be determined by factors such as salary history and duration of employment.

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