The number of essential amino acids in man is

Column-$I$	Column-$II$
$A$. Tyrosine	$P$. Essential amino acid
$B$. Serine	$Q$. Ceric Ammonium Nitrate
$C$. Tryptophan	$R$. Neutral $FeCl_{3}$
$D$. Proline	$S$. Carbylamine Test - Negative

Select the correct set of answer :

The central dogma of molecular genetics states that the genetic information flows from

Which of the following are fibrous proteins?
$A$: Keratin
$B$: Insulin
$C$: Myosin
$D$: Albumin

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?

Which of the following will not give a purple color with ninhydrin?