Two proteins contain the same number of the 20 different amino acids, yet they do not have the same three-dimensional structure and function. This is because:
a. the proteins differ in their carbon side chains.
b. the proteins differ in the sequence of amino acids in the polypeptide chain.
c. the proteins differ in their types of peptide bonds.
d. the proteins differ in their monosaccharide units.
Answer: b. the proteins differ in the sequence of amino acids in the polypeptide chain.
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