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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm107

Which of the following pairs of side chains can stabilise tertiary structure through the stated interaction?

Acysteine and cysteine: disulfide bridge
Bvaline and leucine: hydrophobic interaction
Clysine ( $- NH X_{3} X^{+}$ ) and aspartic acid ( $- COO -$ ): ionic (salt) bridge
Dalanine and valine: ionic bridge

Answer: A, B, C

Cys-Cys forms a covalent

- S - S X^{-}

bond; the oppositely charged side chains of Lys and Asp attract each other; the non-polar isopropyl and isobutyl groups of Val and Leu cluster together. Alanine and valine have uncharged side chains so cannot form an ionic bridge.

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