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Which of these is the smallest structure?
A. Dipeptide
B. Amino acid
C. Polypeptide
D. Protein
The answer is B. Amino Acid Think of it this way - all the structures you mentioned are made up of amino acids. Dipeptide (di = two) is a small molecule made up of two amino acids. Polypeptides, as you mentioned, are a chain of many amino acids (poly = many).
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