Yeast

Yeast is a eukaryotic, unicellular organism and belongs to the kingdom of fungi. Saccharomyces cerevisae (or Baker's yeast) is a common form of yeast often used as a model organism due to it's eukaryotic processes, similar to those of animal cells . This species of yeast replicates by budding. Parent cells in cerevisae can be differentiated by scars formed from budding. The other species; Schizosaccharomyces pombe (fission yeast) replicates by elongation then splitting. Breakthroughs in science involve using this model organism to study the checkpoint chemicals used to control the cell cycle which is a major discovery in cancer chemistry.