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B
Leucine
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C
Lysine
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D
Valine
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Solution
The correct option is C Cysteine The protein is made up of the chain of amino acids. There are 20 amino acids which are attached to each other by peptide bonds depending on the code for the protein on the mRNA. The structure of the amino acids contains central carbon atom which is attached to hydrogen, an amino group, a carboxyl group and the R group. The R group differs in different amino acids. There are two amino acids which contain the sulphur atom in the R group, cysteine and methionine.