What Part of an Animal Cell Act Like Kidneys Animate being Cell BIOLOGY Cells are the structural and functional unit of all living organisms. Some organisms, such as bacteria, are unicellular , consisting of a single jail cell. Other organisms, such as humans, are multicellular , or accept many cells�an estimated 100,000,000,000,000 cells! Each cell can take in nutrients, catechumen these nutrients into energy, bear out specialized functions, and reproduce as necessary. Even more than amazing is that each cell stores its own set of instructions for carrying out each of these activities. Jail cell Organization Information technology is of import to know what organism the prison cell comes from. There are 2 general categories of cells: prokaryotes and