Question

sickle cell anemia is caused by a defect in the
multiple choice
oxygen-carrying pigment hemoglobin.
ability of red blood cells to fight infection.
chloride ion transport protein.
ability of the blood to clot.

Explanation:

Sickle cell anemia arises from a mutation in the gene encoding hemoglobin, the oxygen-carrying pigment in red blood cells. This mutation changes the structure of hemoglobin, causing red blood cells to sickle. Red blood cells do not fight infections (white blood cells do), chloride ion transport defects relate to cystic fibrosis, and blood clotting issues are linked to conditions like hemophilia—not sickle cell anemia.

Answer:

A. oxygen-carrying pigment hemoglobin.