1. Which of the following statements about proteins is incorrect?
(A) All proteins are made up of some combination of 20 essential amino acids.
(B) Like nucleic acids, polypeptides have polarity.
(C) A single polypeptide has primary, secondary and tertiary structures.
(D) α-helix and β-pleated sheets do not require specific sequence of amino acids to form.
(E) Some proteins contain more than one polypeptide chain.
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