Which of the following compounds is an amino acid?

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 :-

Which of the following molecules is eliminated during peptide bond formation?

Protein found in a biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native form is subjected to a physical change like a change in temperature or a chemical change like a change in $pH$,denaturation of proteins takes place. Explain the cause.

Biuret test is used for the detection of

Zwitter ion is formed by