Red blood cells come in many "blood types" including type A, type B, type AB, type O [lacking proteins A and B], Rh positive, Rh negative [lacking Rh+], and many others. If blood is transfused, the recipient detects any new or "foreign" proteins. These blood type proteins are

A. on the outer surface of the red blood cell membrane.
B. in the red blood cell nucleus.
C. inside the red blood cell cytoplasm.
D. in the plasma where they have been secreted by the red blood cells.
E. evenly distributed throughout the cell contents and plasma.


Answer: A

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