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What is the name of the links between sulfur atoms of two cysteine amino acids?

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What is the name of the links between sulfur atoms of two cysteine amino acids?

(a) Disulfide bond

(b) H bond

(c) Hydrophobic interaction

(d) Electrostatic bond

I had been asked this question in examination.

Question is taken from Biopharmaceuticals in section Biopharmaceuticals of Drug Biotechnology

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Right option is (a) Disulfide bond

Explanation: Disulphide bonds are strong covalent links between the sulfur atoms of 2 cysteine molecules. When two sulfur atoms from 2 different cysteine molecules form bind they release a water molecule. It is an oxidative reaction.

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