The structural, functional and biological unit of all organisms.
An autonomous self-replicating unit that may exist as functional independent unit of life (as in the case of unicellular organism), or as sub-unit in a multicellular organism (such as in plants and animals) that is specialized into carrying out particular functions towards the cause of the organism as a whole.
A membrane bound structure containing biomolecules, such as nucleic acids, proteins, and polysaccharides.
Within cells there is an intricate network of organelles that all have unique functions. These organelles allow the cell to function properly.