Proteins are $.......$.

Total number of tripeptides possible by mixing of valine and proline is $............$.

The general structure of $\alpha$-amino acid can be represented as shown below. Which amino acid is not correctly matched with the $R$ group given?

$A$ 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:

Which of the following molecules has the ability to form a zwitterion?

Which of the following statements is false?