Protein can be most easily removed from which of the following?

Out of the following,which type of interaction is responsible for the stabilisation of $\alpha$-helix structure of proteins?

The artificial sweetener aspartame $(A)$,$H_3N^{+}-CH(CH_2COO^{-})-CONH-CH(CH_2Ph)-COOCH_3$,is converted to . . . . . . on storage for extended periods of time in aqueous solution:

The helical structure of protein is stabilised by

What is the total number of essential amino acids?

The correct zwitter ion structure of glycine is