Which of the following metals forms a complex with insulin?

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?

Identify the essential amino acids from the following:
$A$) Leucine
$B$) Tyrosine
$C$) Cysteine
$D$) Histidine

Amino acids are produced on hydrolysis of:

The list given below contains essential amino acids that are basic $(X)$ and also non-essential amino acids that are neutral $(Y)$. Identify $X$ and $Y$ from the following list:
$a)$ Lysine
$b)$ Alanine
$c)$ Serine
$d)$ Arginine
$e)$ Tyrosine

Which of the following amino acids contains an alcohol functional group?