Proteins - are organic compounds that are made primarily of carbon, hydrogen, nitrogen, and some other minor elements that are arranged into 20 different compounds known as amino acids . Nucleic Acids - are composed primarily of different combinations of carbon, hydrogen, nitrogen, oxygen, and phosphorus. They are very complex compounds being created by the atomic linking of thousands of individual atoms. DNA or deoxyribonucleic acid , the genetic blueprint of life, is an example of a nucleic acid. All organisms are composed of one or more of cells .
Cells are the smallest self-functioning unit found in living organisms.
Cells are also where the processes of metabolism and heredity occur in an organism. Cells arise by the cellular division of a previously existing cell. Biologists have differentiated two basic types of cells in organisms. Bacteria , archaea , and cyanobacteria have cells that are quite uncomplicated in terms of structure and function. Quite simply, they lack internal organization.