The tripeptide hormone present in most living cells is...

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

Which of the following is capable of forming a zwitter ion?

The $\alpha-$helix and $\beta-$pleated sheet structures of protein are associated with its:

The synthetic sweetener aspartame,known commercially as NutraSweet,is a methyl ester of a dipeptide. In aqueous solution on standing,it changes to:

Which is an optically inactive amino acid?