Which of the following statements is correct?
a) Three levels of protein structure exist: primary, secondary, and tertiary
b) The functional diversity of proteins does not depend on their chemical makeup.
c) All proteins found in nature contain only D-amino acids.
d) Proline is a unique amino acid because it is the only imino acid in proteins
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your answer is option a
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Three levels of protein structure exist: primary, secondary, and tertiary
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