In an alkaline medium,glycine predominantly exists as/in a/an

Among the following compounds,the most basic amino acid is:

What is the relationship between the isoelectric point and the solubility of amino acids?

The general structure of $\alpha$-amino acid can be represented as shown below. Which amino acid is not correctly matched with the $R$ group given?

The water-soluble protein is:

An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point $6.0$),glutamic acid $(3.2)$,and arginine $(10.7)$ buffered at $pH$ $6.0$. What is the fate of the three amino acids?