The bond that determines the secondary structure of proteins is or secondary structure of protein is due to

Which part of the protein molecule is responsible for the function and activity of the proteins?

Coagulation of egg white on boiling is an example of denaturation of protein. Explain it in terms of structural changes.

The following tripeptide structure is composed of three amino acids. Identify the correct sequence of amino acids in the tripeptide:
(Structure: $H_2N-CH(CH_2Ph)-CO-NH-CH(CH_3)-CO-NH-CH(CH_2OH)-COOH$)

Which of the following foodstuffs contains nitrogen?

At the isoelectric point: