The simplest amino acid is

In protein synthesis,the first amino acid is known as $.....P.....$ and the last amino acid is known as $.....Q.....$.

How many amino acids are involved in protein synthesis?

Which groups are responsible for amino acids acting as electrolytes?

The formation of protein is considered as:

What is the number of $-COOH$,$-NH_2$,$-H$,and $-R$ groups respectively in the structure of an amino acid?