Answer:
They tend to have the amide nitrogen protonated to give a positive charge.
Explanation:
A peptide bond joins two consecutive amino acids in the protein. The peptide bond is present between -CO group (also known as carboxyl group) of one amino acid and -NH2 group (also known as amino group) of another amino acid. It is represented as -CONH bond. Therefore, it is an amide linkage. The peptide bond always has planar orientation with trans configuration.
Trans configuration avoids steric hindrance and hence, add to stability of the peptide bond.
Nitrogen atom of peptide bond never bear positive charge
Therefore, the incorrect statement is as follows:
They tend to have the amide nitrogen protonated to give a positive charge.
