This unit deals with the structure and properties of lipids including steroids, carbohydrates and amino acids and aspects of their biosynthesis as well as their metabolism. It provides a chemical understanding of the role of acetylcoenzyme A in energy production and biosynthesis. It also deals with the metabolism of endogenous and exogenous chemicals and the role of chemicals in the cause and treatment of cancer. The unit also introduces drug properties, their mode of action and outlines modern methods of drug discovery. CHEM503 includes additional topics and greater depth of coverage of the material demanding a higher level of understanding in assessment tasks.