`alpha-` amino acids are

What are alpha- amino acids?

Proteins are made up of alpha - amino acids. They are actually polypeptides having high molecular mass. Name an optically inactive alpha - amino acid found in proteins.

(i) Write the Zwitter ion form of an alpha -amino acid. (ii) Name the naturally occurring alpha -amino acids that is not optically active.

Which of the following alpha -amino acids does not contain a chiral carbon ?

The structural feature which distinguishes proline from alpha - amino acids is that