A hemoglobin molecule can bind four O2 molecules

A hemoglobin molecule can bind four O2 molecules

A hemoglobin molecule can bind four O2 molecules. Assume that e is the energy of each bound O2, relative to O2 at rest at infinite distance. Let ? denote the absolute activity exp (?1/I?) of the free O2 (in solution)
(a) What is the probability that one and only one O2 is absorbed on a hemoglobin molecule? Sketch the result qualitatively as a function of ?.
(b) What is the probability that four and only four O2 are adsorbed? Sketch this result also.  

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