Which of the Following Statements Is Not Correct About Amino

Multiple Choice

Which of the following statements is not correct about amino acids and proteins?

A) There are 20 different amino acids
B) Structures of the amino acids can be modified
C) Side chains are designated R-groups, which can belong to one of four classes: hydrophobic, hydrophilic, acidic, and basic
D) Peptide bonds are formed between the amino groups of two amino acids
E) All of these are correct