In a linear tetrapeptide (constituted with different amino acids),the value of (number of amino acids) - (number of peptide bonds) is:

Name two $\alpha$-amino acids which form a dipeptide which is $100$ times more sweet than cane sugar?

$A$ tetrapeptide $x$ on complete hydrolysis produced glycine $(Gly)$,alanine $(Ala)$,valine $(Val)$,and leucine $(Leu)$ in equimolar proportions. The number of possible tetrapeptide sequences involving each of these amino acids exactly once is:

The structures of glycine and alanine are given below. Show the peptide linkage in glycylalanine.
$H_2N-CH_2-COOH$ (glycine);
$H_2N-CH(CH_3)-COOH$ (alanine)

$HC\equiv CH$ $\xrightarrow[HgSO_4]{H_2SO_4} (A)$ $\xrightarrow[(1) NH_3 + HCN]{(2) H_3O^{\oplus}} (B);$ The product $(B)$ of the given reaction is:

Subunits present in haemoglobin are