Choose the hemoglobin that has the highest oxygen affinity.
A) Hb A
B) Hb F
C) Methemoglobin
D) Sulfhemoglobin

Question

Quizplus · Accepted Answer

Hemoglobin F (Hb F) has the highest oxygen affinity among the choices given. This is because Hb F has two alpha and two gamma chains, while Hb A and Hb A2 have two alpha and two beta chains. The gamma chains have a higher affinity for oxygen than the beta chains, which results in Hb F binding oxygen more tightly than the other hemoglobins. Methemoglobin and sulfhemoglobin have different iron states and therefore do not bind oxygen well.

Choose the Hemoglobin That Has the Highest Oxygen Affinity