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JEE Main levelSingle correct optionDifficulty 2 of 3bm092

Which of the following interactions stabilising tertiary structure is a covalent bond?

Asalt bridge between $- NH X_{3} X^{+}$ and $- COO -$ side chains
Bdisulfide bridge between two cysteine residues
Chydrogen bond between side chains
Dhydrophobic interaction between non-polar side chains

Answer: B

Two cysteine

- SH

groups are oxidised to the covalent

- S - S X^{-}

bridge. Hydrogen bonds, salt bridges and hydrophobic interactions are non-covalent.

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