BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Amino acids can act as both an acid and a base due to the presence of the amino and carboxyl functional groups. The pH at which a given amino acid exists in solution as a zwitterion is called the isoelectric point (pI).

Detailed explanation-2: -Amino acids all have very similar physical properties. This statement is false. The physical properties of Amino Acids vary considerably.

Detailed explanation-3: -All other amino acids contain four different groups. Hence all other amino acids are optically active. Therefore the correct statement is, all amino acids except glycine are optically active.

Detailed explanation-4: -Another important feature of free amino acids is the existence of both a basic and an acidic group at the -carbon. Compounds such as amino acids that can act as either an acid or a base are called amphoteric.

Detailed explanation-5: -Amino acids behave like salts rather than simple amines or carboxylic acids.