A specialized structure within a cell that performs a particular function necessary for the cell’s survival, maintenance, or activity.
Organelles allow different cellular processes to occur in organized compartments. Examples include the nucleus, which contains most of the cell’s DNA; mitochondria, which perform important metabolic functions; and lysosomes, which help break down cellular materials.
Some organelles are surrounded by membranes, while others are not. The term is generally used for specialized structures within cells, particularly eukaryotic cells.
QUICK FACT
Not every structure inside a cell is necessarily classified as an organelle. The term generally refers to specialized cellular structures with defined functions.
COMMONLY CONFUSED WITH
Cell: An organelle is a structure within a cell; a cell is the fundamental living unit that contains multiple structures and carries out life processes.
SEE ALSO
- Mitochondria
- Nucleus
- Cell
- DNA