<span>The answer is e. Myoglobin has a single polypeptide chain so it has 1o, 2o, 3o and 4o 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 (4o) structure. 4o structure of proteins includes an arrangement of multiple folded polypeptide chains (subunits) in a multi-subunit complex. Therefore myoglobin cannot have 4o structure as the single chain polypeptide. All other choices are correct.</span>
The central element for all living things is carbon, which is why you might often hear the phrase "carbon-based" lifeforms. Another term is often "organic matter"
