In cell biology, an organelle (pronunciation: /ɔː(r)gəˡnɛl/)'s a specialized subunit within a cell that's a specific function, and's usually separately enclosed within its own lipid membrane. The name organelle comes from the idea that these structures are to cells what an organ's to the body (hence the name organelle, the suffix -elle being a diminutive). Organelles are identified by microscopy, and can also be purified by cell fractionation. There're many types of orga… (More on Organelle)