Which of the following is a conjugated protein?

In a linear tetrapeptide (constituted with different amino acids),the value of (number of amino acids) - (number of peptide bonds) is:

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

Which of the following amino acids contains an imidazole ring?

The monomer of a polypeptide is........

The structure of protein that is unaffected by heating is ... .