Cells often contain hundreds of mitochondria. A nucleus is a large organelle that stores DNA and serves as the cell’s command center. Single-cell organisms are usually prokaryotic, while multi-cell organisms are usually made of eukaryotic cells.Īnother large organelle found in eukaryotic cells is the mitochondrion, an organelle responsible for making ATP, a chemical that organisms use for energy. Organelles are specialized structures that perform various jobs inside cells. The term literally means “little organs.” In the same way organs, such as the heart, liver, stomach, and kidneys, serve specific functions to keep an organism alive, organelles serve specific functions to keep a cell alive.Ĭells are grouped into two different categories, prokaryotic cells and eukaryotic cells, which are primarily differentiated by the presence of one organelle, the nucleus. Prokaryotic cells do not have a nucleus, whereas eukaryotic cells do.
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