A 42-Year-Old Man of European Ancestry Is Found to Have

Multiple Choice

A 42-year-old man of European ancestry is found to have a blood hemoglobin concentration of 36% (normal, 40% to 54%) .Blood analysis shows the presence of abnormally rounded and elliptical erythrocytes, and these cells are more easily destroyed than normal cells by exposure to hypotonic saline solution.The structural protein that is most likely reduced in the blood cells of this patient is:

A) Actin.
B) Spectrin.
C) -Actinin.
D) Tubulin.
E) Keratin.