The most important energy source in every living cell is $......$.

The dipeptide,$Gln-Gly$,on treatment with $CH_3COCl$ followed by aqueous work-up gives:

Pepsin enzyme hydrolyses:

Assertion $(A)$: An optically active amino acid can exist in three forms depending on the $pH$ of the solution.
Reason $(R)$: Amino acids contain both acidic and basic groups; they exist as a zwitterion in aqueous medium,anionic form in basic medium,and cationic form in acidic medium.

Assume that a particular amino acid has an isoelectric point of $6.0$. In a solution of $pH$ $1.0$,which of the following species will predominate?

Which of the following is $NOT$ a globular protein?