The number of essential and non-essential amino acids from the following list respectively is:
Val,Gly,Leu,Lys,Pro,Ser

Write a general introduction and the importance of proteins.

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

What are essential and non-essential amino acids? Give two examples of each type.

Identify the acidic amino acid from the following (represented by using three-letter symbols).

In the following compound,the favourable site/s for protonation is/are:
(Image description: Adenine structure with labels $a$ on the exocyclic $-NH_2$ group,$b$ on the pyrimidine ring nitrogen,$c$ on the other pyrimidine ring nitrogen,$d$ on the imidazole ring nitrogen,and $e$ on the imidazole ring $-NH-$ group.)