Which of the following can be used to detect the presence of $\alpha$-amino acids?

Natural silk is a

Identify the side chain $(R)$ group present in Leucine,an amino acid.

$A$ short peptide on complete hydrolysis produces $3$ moles of glycine $(G)$,$2$ moles of leucine $(L)$ and $2$ moles of valine $(V)$ per mole of peptide. The number of peptide linkages in it are $..............$.

Amino acids behave like salts rather than simple amines or carboxylic acids. Explain.

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.