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Which of the following statements is FALSE? Which of the following statements is FALSE? Myoglobin is a single polypeptide chain folded about a heme prosthetic group. Hemoglobin is a tetramer, each of which binds a heme group. In both hemoglobin and myoglobin, iron is chelated by a tetrapyrole ring system. The iron in both hemoglobin and myoglobin has two coordination sites that bind to oxygen.

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That would be D(the last one).

Iron in both hemoglobin and myoglobin has 1 coordination site that bind to O2.

Each iron chelated in a tetrapyrrole/porphyrin ring can bind to one oxygen molecule. That is why we say hemoglobin can carry a maximum number of 4 O2 molecules. (See attached pic)

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