Amino acids are

Assume that a particular amino acid has an isoelectric point of $6.0$. In a solution at $pH$ $1.0$,which of the following species will predominate?

The structural formula of the amino acid,isoleucine,is:

Denaturation of proteins leads to loss of its biological activity by

Peptide linkage is present in:

During the denaturation of proteins,which of these structures will remain intact?