The $\alpha$-helix structure is found in:

The value of $x$ in compound '$D$' is $.........$.

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:

Which functional group participates in disulphide bond formation in proteins?

The molecular weight of protein is

Which one of the following amino acids has an isoelectric pH greater than $7$?