All of the following are examples of posttranslational modifications, EXCEPT________
A) Prosthetic groups, such as metals or vitamins, can be added.
B) Polypeptides can be degraded and then reassembled to produce entirely different sequenced polypeptides.
C) Individual amino acid residues are sometimes modified, such as adding a phosphates, acetyl, or methyl groups can be added.
D) Polypeptide chains can be cleaved to produce a shorter and functional polypeptide.
E) The N-terminal amino acid is often removed or modified.
Answer: B
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