Q.Haemoglobin, assembled from two alpha and two beta polypeptide subunits, each carrying its own haem group, is a classic example of a protein exhibiting:

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Haemoglobin's assembly from four separate polypeptide subunits (2 alpha + 2 beta) is an example of quatern …

Quaternary structure describes how two or more separate polypeptide chains (subunits or protomers), each already folded into its own tertiary structure, associate together to form the final, functional multi-subunit protein. Haemoglobin is the standard example, built from two alpha and two beta subunits, each carrying its own haem group. A protein consisting of only a single polypeptide c …

Recognise that quaternary structure is specifically about the association of multiple separate polypeptide subunits, which is exa …

Calling haemoglobin's multi-subunit assembly "tertiary structure" -- tertiary structure describes the folding of one chain; …