Unicellular

A Unicellular organism is an organism consisting of only a single cell. Example of a unicellular organism include Protozoa such as amoeba, cilia and paramecium.. Unicellular organisms are often used as models to study various processes that occur in the eukaryotic cell. One such example is Saccharomyces cerivisiae, one of the most common used by biologists, and is used to study processes such as mitosis and meiosis. Unicellular organisms allow us to study much larger, more complex systems by first looking at how things function at the cellular level.