Biochemistry attempts to unravel the complex chemical reactions that occur in a wide range of life forms. It provides the basis for practical advancements in medicine, biotechnology, veterinary medicine and agriculture. A biochemist aims to determine how specific molecules, such as proteins, nucleic acids, lipids, vitamins and hormones, work in these systems. The regulation of chemical reactions in living cells is of particular importance. It causes and covers exciting new areas such as bioengineering and molecular genetics.