Which Statement Comparing Human Adult and Fetal Hemoglobin is True

Question

Which statement comparing human adult and fetal hemoglobin is true?
A) Fetal hemoglobin contains one particular subunit that lowers its P50.
B) Fetal hemoglobin contains one particular subunit that raises its P50.
C) All subunits of fetal hemoglobin are different and result in a lower P50.
D) All subunits of fetal hemoglobin are different and result in a higher P50.

Accepted Answer

Fetal hemoglobin contains gamma subunits instead of beta subunits, which lowers its P₅₀, allowing it to bind oxygen more tightly than adult hemoglobin.