Sanger's reagent is used for the identification of which of the following?

Which of the following statements are correct? A) $\alpha - \text{amino acids present in protein is L- amino acid.}$ B) $\text{Amino acids contain } NH_2 \text{ as well as COOH group.}$ C) $\text{Number of amino group and carboxylic group are same in amino acids always.}$ D) $\text{Tryosine was firstly obtained from cheese.}$ Choose the correct alternatives from below:

In which of the following processes does protein $NOT$ participate?

Which of the following amino acids is not optically active?

Which of the following molecules has the ability to form a zwitterion?

Which structure$(s)$ of proteins remain$(s)$ intact during the denaturation process?