Who proposed the most widely accepted classification system for amino acids?

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$A$. Collagen	$I$. Enzyme
$B$. $\text{GLUT}-4$	$II$. Most abundant enzyme in biosphere
$C$. Trypsin	$III$. Most abundant protein in animal world
$D$. RuBisCO	$IV$. Enables glucose transport into cells

Choose the correct answer from the options given below:

Name the main constituent of the food,in the absence of which one cannot live.

What type of amino acids are phenylalanine and tyrosine,respectively?

$A$: Hemoglobin is a molecule formed by interactions between four heme groups.
$R$: Hemoglobin is a quaternary protein.

How many types of amino acids are involved in protein synthesis?