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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm109

Which statements about the levels of protein structure are correct?

ASecondary structure is stabilised mainly by interactions between R groups.
BQuaternary structure is found only in proteins made of more than one polypeptide chain.
CPrimary structure is the sequence of amino acids in the chain.
DTertiary structure is the overall three-dimensional folding of a single polypeptide chain.

Answer: B, C, D

The primary level is the sequence, the tertiary level is folding of one chain, and the quaternary level is the arrangement of several chains. Secondary structure depends on backbone hydrogen bonds, not on the R groups.

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