Which Statement Is False About the Heme Group

Multiple Choice

Which statement is false about the heme group?

A) When oxygen binds to heme, the iron ion is oxidized from Fe²⁺ to Fe³⁺.
B) If exposed to air, a free heme group not associated with hemoglobin) is readily oxidized converting Fe²⁺ to Fe³⁺ and can no longer bind oxygen.
C) The heme group is tightly, but non-covalently, held in myoglobin molecule.
D) The chemical structure of the heme groups in myoglobin and hemoglobin are identical.