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Which of the following will be a characteristic of homotypic quaternary structure?(a) Formed by any single peptide chain in a whole protein molecule(b) Arrangement of polypeptide chains(c) Association between identical polypeptides(d) Association between subunits of different structureThe question was asked in a job interview.I need to ask this question from Biopharmaceuticals in division Biopharmaceuticals of Drug Biotechnology

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Correct answer is (C) Association between identical polypeptides

Easiest explanation: The biological function of some molecules is determined by MULTIPLE POLYPEPTIDE chains. Two kinds of quaternary STRUCTURES: both are multi-subunit proteins. Homotypic which is an association between identical polypeptide chains. Heterotypic which will be interactions between subunits of very different structures.



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