The total number of basic groups in the following form of lysine is:

Which of the following statements is $NOT$ correct for amino acids?

Which is an essential constituent of diet?

The condensation polymer among the following is

In an oligopeptide named Alanyl-glycyl-phenyl-alanyl-isoleucine,the number of $sp^2$ hybridised carbons is $...........$.

For an amino acid,the ionization constant for the carboxyl group is $pK_{a_1} = 2.34$ and for the ammonium ion is $pK_{a_2} = 9.6$. At what $pH$ will the isoelectric point of the amino acid be?