What type of peptide is glycylalanine?

The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is

The number of tripeptides formed by $3$ different amino acids using each amino acid once is.................

$\alpha$-$helix$ is a secondary structure of proteins formed by twisting of polypeptide chain into right-handed screw-like structures. Which type of interactions are responsible for making the $\alpha$-$helix$ structure stable?

Identify the neutral amino acid from the following list represented by three-letter symbols.

The non-essential amino acid among the following is