Arginine has three ionizable groups. The pk of a-COOH is 2.18; a-NH 3+, 9.09; and the R-group, 13.20. What is the charge of arginine at pH = 12? O O O -2

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Vitamins and Coenzymes

A class of organic compounds needed in the human body for normal activities is known as vitamins. They are characterized into two parts depending upon their solubility in water. They can act as coenzymes, cofactors, or prosthetic groups for enzymes.