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

Example$(s)$ of aromatic amino acid is/are:

Which of the following are fibrous proteins?
$A$: Keratin
$B$: Insulin
$C$: Myosin
$D$: Albumin

Which of the following will not exist in zwitter ionic form at $pH = 7$?

The correct statement in respect of the protein haemoglobin is that it

For $\alpha$-amino acids having the structure $R-CH(NH_2)-CO_2H$,which of the following statements are true?
$(a)$ Water solubility is maximum at a $pH$ when concentrations of anions and cations are equal.
$(b)$ They give ninhydrin test.
$(c)$ On reacting with nitrous acid,they give off $N_2$.