Which Statement About Human Fetal Hemoglobin Is True

Multiple Choice

Which statement about human fetal hemoglobin is true?

A) Its molecules become saturated with O₂ at higher PO₂ values than those of adults.
B) It has a higher affinity for O₂ than does adult hemoglobin.
C) It has more than four polypeptide chains, so one hemoglobin molecule can carry more than four O₂ molecules.
D) Its O₂-binding/dissociation curve is shifted to the right of the curve for adults.
E) It has a higher affinity for 2,3-bisphosphoglyceric acid (BPG) than does adult hemoglobin.