SAT Subject Biology Practice Question 154: Answer and Explanation

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Question: 154

4. People with an A-positive blood type may safely donate blood to those with which blood type?

A. A negative
B. B positive
C. O negative
D. AB positive
E. AB negative

Correct Answer: D


Blood recipients that lack the A antibody cannot receive blood from donors with the A antibody (blood types A and AB). Positive and negative blood types refer to Rh system (specifically, the D antibody). Recipients that lack this antibody (negative) cannot receive blood from positive donors. Therefore, the only safe recipients of A-positive blood are A positive and AB positive.

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