BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Which of the following does not exist as a Zwitter ion ? Glycine exists as NH3+CH2COO−, zwitter ion but anthranilic acid (p-amino benzoic acid) does not exist as zwitter ion.

Detailed explanation-2: -The correct option is B Uracil Among the -amino acids-threonine, tyrosine, methionine, arginine and tryptophan, those which contain an aromatic group in their side chain are: Q.

Detailed explanation-3: -Solution : Sulphonilic acid exists as zwitterion.

Detailed explanation-4: -There is an internal transfer of a hydrogen ion from the-COOH group to the-NH2 group to leave an ion with both a negative charge and a positive charge. This is called a zwitterion.

Detailed explanation-5: -The structure of an amino acid allows it to act as both an acid and a base. An amino acid has this ability because at a certain pH value (different for each amino acid) nearly all the amino acid molecules exist as zwitterions.