Amino Acids and Peptide Bonds — Prelims Questions

Which of the following statements about the peptide bond is INCORRECT?

Which of the following amino acids is achiral?

At a pH significantly lower than its pI, an amino acid will predominantly exist in which form?

Which of the following amino acids is classified as an essential amino acid for humans?

Which of the following is a characteristic feature of the R-group of a basic amino acid?

During the formation of a peptide bond, which functional groups react, and what molecule is released?