The helical structure of protein is stabilized by

An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point $6.0$), glutamic acid $(3.2)$, and arginine $(10.7)$ buffered at $pH$ $6.0$. What is the fate of the three amino acids?

In an oligopeptide named Alanyl-glycyl-phenyl-alanyl-isoleucine,the number of $sp^2$ hybridised carbons is $...........$.

The number of disulphide linkages present in insulin are

Which of the following is not a globular protein?

The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is