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| A cell is a basic unit of all forms of life. |
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| Cell theory is the fundamental concept of biology that states that all living things are composed of cells; that cells are the basic units of structure and function in living things; and that new cells are produced from existing cells. |
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| A cell membrane is a thin, flexible barrier that surrounds all cell; regulates what enters and leaves the cell. |
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| A eukaryote is a organism whose cells contain a nucleus. |
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| A nucleus is the center of an atom, which contains the protons and nuetrons ; in cells, structure that contains the cell's genetic material in the form of DNA |
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Definition
| A prokaryote is a unicellular organism that lacks a nucleus. |
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