" How many dipeptides are possible with amino acids glycine and "(+-)" alanine "

Amino acid alanine is

The number of tripeptides formed by three amino acids: glycine, alanine and serine is

How many dipeptides are possible from two molecules of a typical alpha -amino acid ?

How many of given are essential athino acids? Glycine, Alanine, Valine, Leucine, Proline, Methionine.

How many different tripeptides can be obtained from alanine, glycine and phenylalanine, each tripeptide containing all the three amino acids?

How many amino acids are present in insulin ?

The total number of homo-and hetero-dipeptide that can be obtained formed from glycine and alanine is