Hemoglobin: a) binds oxygen with a higher affinity than myoglobin due to the presence of four heme groups vs. only one in myoglobin.
b) binds oxygen with a lower affinity than myoglobin due to the presence of four heme groups vs. only one in myoglobin.
c) binds to oxygen with a lower affinity than myoglobin due to the presence of the T-state that is absent irn myoglobin.
d) binds to oxygen with a higher affinity than myoglobin due to the presence of the R-state that is absent in myoglobin.