NEET BIOLOGY

Detailed explanation-1: -In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton, giving rise to a dipolar ion known as zwitter ion. This is neutral but contains both positive and negative charges.

Detailed explanation-2: -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. If acid is added to a solution containing the zwitterion, the carboxylate group captures a hydrogen (H+) ion, and the amino acid becomes positively charged.

Detailed explanation-3: -In aqueous solution, an amino acid exists as a dipolar ion, which is known as Zwitter ion.

Detailed explanation-4: -Most amino acids become zwitterions when dissolved in water but not all do. Whether or not an amino acid will become zwitterionic when dissolved in water depends entirely on the chemical structure of the amino acid. Only amino acids with a side chain that is capable of being charged will become zwitterions in water.

Detailed explanation-5: -Zwitterions in simple amino acid solutions An amino acid has both a basic amine group and an acidic carboxylic acid group. 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.