BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Panel 1: The 3 positively charged amino acids are shown. These are: histidine (His, H), lysine (Lys, K), and arginine (Arg, R).

Detailed explanation-2: -Arginine, an essential amino acid, has a positively charged guanidino group. Arginine is well designed to bind the phosphate anion, and is often found in the active centers of proteins that bind phosphorylated substrates.

Detailed explanation-3: -Charge of the amino acid side chains At pH=7, two are negative charged: aspartic acid (Asp, D) and glutamic acid (Glu, E) (acidic side chains), and three are positive charged: lysine (Lys, K), arginine (Arg, R) and histidine (His, H) (basic side chains).

Detailed explanation-4: -Positively charged polar R-groups Lysine and arginine, two of the three basic amino acids, both have a nitrogen containing side chain that is positively charged at a physiological pH.