26) The figure below shows that the Myoglobin (Mb) and Hemoglobin (Hb) O2 binding curves are hyperbolic and sigmoidal, respectively, indicating that Mb binding is non-cooperative and Hb binding is cooperative. What is the allosteric effect on O2 binding to the second subunit of hemoglobin after the 1st molecule of oxygen has bound? What state would hemoglobin be in after O2 binding?
A) An increase in affinity of hemoglobin for O2; R-State (relaxed)
B) An increase in affinity of hemoglobin for O2; T-State (taut)
C) A decrease in affinity of hemoglobin for O2; R-State (relaxed)
D) A decrease in affinity of hemoglobin for O2; T-State (taut)
