Which of the following reagents gives a blue colour with proteins?

The test used for identifying peptide linkage in proteins is

Which of the statements about "Denaturation" given below are correct?
$A$. Denaturation of proteins causes loss of secondary and tertiary structures of the protein
$B$. Denaturation leads to the conversion of double strand of $DNA$ into single strand
$C$. Denaturation affects primary structure which gets distorted

Which protein present in muscles is insoluble in water?

Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is called . . . . . . structure of that protein.

Choose the correct option for structures of $A$ and $B,$ respectively.