$\alpha$-helix is found in

If there are $20$ naturally occurring amino acids,what is the maximum number of tripeptides that can be formed?

What is the process of protein synthesis based on genetic information called?

An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point $6.0$),glutamic acid $(3.2)$,and arginine $(10.7)$ buffered at $pH$ $6.0$. What is the fate of the three amino acids?

The acid showing salt-like character in aqueous solution is

Which of the following statements is $NOT$ correct for amino acids?