Cell nucleus

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The Nucleus of a cell is a small round object found inside a cell. It is the command centre of the cell. Inside the Nucleus you find genes which has DNA inside it, which are the building blocks of life. You have billions of cells inside your body and that means billions of nuclei (nuclei is the plural of Nucleus). Even egg yolks are Nuclei. Ostrich eggs have the largest yolks and that means they have the largest nuclei. Some viruses attack the nucleus of a cell to use it to make more viruses.

Some Bacteria are a special type of cells
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Some Bacteria are a special type of cells

Some animals (like amoebas) are animals made up of one cell and they reproduce by splitting in half. This means that an amoeba is a single-celled organism (living thing). Many bacteria are single-celled organisms.

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