BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The structure for hemoglobin is very similar to myoglobin except that it has a quaternary structure due to the presence of four protein chain subunits. Actually, there are two pairs of similar chains-two alpha types and two beta types. Each protein chain subunit contains a heme group with the iron attached.

Detailed explanation-2: -Hemoglobin is an allosteric protein. When one heme group in hemoglobin binds oxygen, it is easier for successive oxygen molecules to bind at the remaining three sites.

Detailed explanation-3: -Hemoglobin is a tetramer that possesses a quaternary structure containing multiple folded polypeptide structures (tertiary structures). A tertiary protein will commonly contain a single polypeptide chain with one or more secondary structures.

Detailed explanation-4: -Tertiary structure represents the overall three-dimensional shape of the overall protein, including its atom configurations. Quaternary structure occurs when multiple amino acid chains combine to form a three-dimensional protein complex. Quaternary proteins represent functional proteins.