BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The tertiary structure of myoglobin is that of a typical water-soluble globular protein. Its secondary structure is unusual in which it contains a very high proportion (75%) of -helical secondary structure. Each myoglobin molecule contains a single heme group inserted into a hydrophobic cleft in the protein.

Detailed explanation-2: -Haemoglobin has a quaternary structure composed of two alpha and two beta subunits, whereas myoglobin has a tertiary structure.

Detailed explanation-3: -Myoglobin is a simple protein consisting of a single polypeptide. Since the quaternary structure is composed of an assembly of subunits of polypeptides, myoglobin does not have a quaternary structure. Due to the lack of multiple subunits, it has the highest level of structure as tertiary.

Detailed explanation-4: -Myoglobin (Mb) is a heme-containing globular protein that is found in abundance in myocyte cells of heart and skeletal muscle.

Detailed explanation-5: -The nature of this folding is referred to as tertiary structure, since it involves a third organizational level above the primary amino acid sequence and the secondary helix or sheet. Figure 20.16. 1 Structure of myoglobin. The dots represent carbon atoms along the polypeptide chain.