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B
Hopkins
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C
Beevers
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D
Sutherland
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Solution
The correct option is A Hopkins The proteins are made up of amino acids. The amino acids are linked together by peptide bonds to form a protein. The amino acids which cannot be synthesized inside the body rather it is taken through the diet are known as essential aminoacids. Frederick Gowland Hopkins discovered the essential amino acids. The amino acid tryptophan, was isolated from its protein in 1901.