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JEE Advanced levelSingle correct optionDifficulty 3 of 3bm101

A polypeptide has molar mass 12000 g/mol and contains 10 cysteine residues, all of which are oxidised pairwise to disulfide bridges (no other change; atomic mass of H = 1). The molar mass of the oxidised protein is

A11980 g/mol
B12010 g/mol
C11990 g/mol
D11995 g/mol

Answer: C

Each

- SH + HS X^{-} - S - S X^{-}

link removes 2 H atoms. Ten Cys residues make 5 disulfide bridges, a loss of

5 \times 2 = 10

g/mol. Mass =

12000 - 10 = 11990

g/mol.

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