In cell biology, an organelle is a specialised subunit within a cell that haes a speceefic function, in that thair function is vital for the cell tae live. Individual organelles are uisually separately enclosed within thair awn lipid bilayers.
The name organelle comes frae the idea that thir structures are pairts o cells, as organs are tae the bouk, hence organelle, the suffix -elle bein a diminutive. Organelles are identifee'd bi microscopy, an can an aa be purifee'd bi cell fractionation. Thare are mony teeps o organelles, pairteecularly in eukaryotic cells. While prokaryotes dae nae possess organelles per se, some dae conteen protein-based bacterial microcompartments, that are thocht tae act as primitive organelles.