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B
Serine
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C
Cysteine
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D
Tyrosine
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Solution
The correct option is C Cysteine Option (c)
You can clearly see that cysteine is the only amino acid from the options given which contains a sulphur in its structure. You can remember this by going back to the video of the secondary structure of proteins where we talka about the Disulphide linkages which gives shape to the protein sheets.