The number of $sp^2$ hybridised carbons present in "Aspartame" is

Which of the following amino acids contains an imidazole ring?

Assertion $(A)$: In aqueous solution,$\alpha$-amino acids exist as an internal salt called a zwitter ion.
Reason $(R)$: Proline is a natural amino acid having a secondary amino group. The correct option among the following is:

Assertion : Proteins are made up of $\alpha-$ amino acids.
Reason : During denaturation,secondary and tertiary structures of proteins are destroyed.

Which of the following is a condensation polymer?

Among the following,the achiral amino acid is