BIOMOLECULES AND ENZYMES

Detailed explanation-1: –Therefore Proline is the amino acid containing secondary amine in its structure.

Detailed explanation-2: -an essential amino acid, has a positively charged -amino group (a primary amine). Lysine is basically alanine with a propylamine substituent on thecarbon. The -amino group has a significantly higher pKa (about 10.5 in polypeptides) than does the -amino group.

Detailed explanation-3: -form under biological conditions), an -carboxylic acid group (which is in the deprotonated −COO− form under biological conditions), and a side chain lysyl ((CH2)4NH2), classifying it as a basic, charged (at physiological pH), aliphatic amino acid.

Detailed explanation-4: -Two amino acids, serine and threonine, contain aliphatic hydroxyl groups (that is, an oxygen atom bonded to a hydrogen atom, represented as ―OH).