The most important energy carrier in all the living cells is

Which of the following molecules is capable of forming a Zwitter ion?

The correct structure of Rhumann's Purple,the compound formed in the reaction of ninhydrin with proteins is :

$NH_2-CH(CH_3)-CO-NH-CH_2-COOH$
Identify the amino acids obtained by the hydrolysis of the above compound.

Explain the classification of proteins based on their molecular structure.

Sulphur $(S)$ containing amino acids from the following are:
$(a)$ isoleucine
$(b)$ cysteine
$(c)$ lysine
$(d)$ methionine
$(e)$ glutamic acid