The structural formula of the amino acid,isoleucine,is:

Which among the following amino acids has the lowest molecular mass?

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 :-

Serine $(HOCH_2CH(NH_2)COOH)$ is an amino acid. The correct Fischer projection of $L$-serine is:

Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: $A$ solution of the product obtained by heating a mole of glycine with a mole of chlorine in the presence of red phosphorus generates a chiral carbon atom.
Reason $R$: $A$ molecule with $2$ chiral carbons is always optically active.
In the light of the above statements,choose the correct answer from the options given below:

Which is not true for arginine?