Which of the following amino acids will give a violet-coloured complex with neutral ferric chloride solution?

Which of the following is not an essential amino acid?

Compounds containing both amino and $-COOH$ groups are known as

Albumin proteins are most abundant in

$A$ tetrapeptide is made of naturally occurring alanine,serine,glycine,and valine. If the $C$-terminal amino acid is alanine and the $N$-terminal amino acid is chiral,the number of possible sequences of the tetrapeptide is $....$

Choose the peptide that matches the abbreviation $Phe-Val-Ala$.