BIOLOGY
PROTEINS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is special about the amino acid cysteine?
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Cysteine has a nonpolar side chain, which is lipid-like
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Cysteine has a polar hydroxyl group, which can participate in hydrogen bond formation
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Cysteine has a side chain that can be either positively charged or neutral depending on the environment‘s pH and function as a buffer
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Cysteine has a side chain with a sulfhydryl (-SH) group, which can form disulfide bonds
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Explanation:
Detailed explanation-1: -SO WHY CYSTEINE IS SPECIAL? Because it has a very reactive sulfhydryl group at its side chain. This puts cysteine in special position that cannot be replaced or substituted by any other amino acid. Because disulfide bridges formed by cysteine residues are permanent component of protein primary structure.
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