The answer is e. Myoglobin has a single
polypeptide chain so it has 10, 20, 30 and 40
structure.
Myoglobin is an iron and an oxygen binding
protein. It has a single polypeptide chain.
Proteins with the single polypeptide chain
cannot have quaternary (40) structure. 40
structure of proteins includes an arrangement of
multiple folded polypeptide chains (subunits) in
a multi-subunit complex. Therefore myoglobin
cannot have 40 structure as the single chain
polypeptide. All other choices are correct.
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