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Nucleus
Nearly every single cell has a nucleus. (Only bacteria and blue-green algae
lack a nucleus.) The nucleus controls and regulates the activities of cell.
It is also where all genetic information is stored. Most nuclei* are surrounded
by a cell membrane. The nucleus shown below is surrounded by a dark- blue membrane.
The membrane stops genetic material from floating around inside the cell.
* Nuclei is the plural form of nucleus.
Next, find out how a nucleus keeps genetic information organized.
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