Which of the following is a basic amino acid?

What is the molecular weight of a protein?

Proteins contain which of the following elements?

The secondary structure of proteins is stabilized by which bond?

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

List-$I$ Natural Amino acid	List-$II$ One Letter Code
$A$. Arginine	$I$. $D$
$B$. Aspartic acid	$II$. $N$
$C$. Asparagine	$III$. $A$
$D$. Alanine	$IV$. $R$

Choose the correct answer from the options given below :-

Consider the following statements:
Statement-$I$: Lysine and arginine are essential and basic amino acids.
Statement-$II$: Leucine and phenylalanine are non-essential and neutral amino acids.