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| Lack a membrane-bound nucleus and organelles; bacteria and archaea. |
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| Often live in extreme habitats and have unique genetic, biochemical and physiological characteristics. |
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Have a membrane-bounded nucleus and organelles.
- found in organisms within the kingdoms protista, plantae, fungi, and anamalia. |
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First proposed by Schledian and Schwann.
1. All known living things are made up of cells
2. The cell is structural and functional unit of all living things.
3. All cells come from preexisting cells by division.
4. Cells contain hereditary information which is passed from cell to cell during cell division.
5. All cells are basically the same in chemical composition.
6. All energy flow (metabolism and biochemistry) of life occurs within cells. |
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Human cells are all microscopic (150 micrometers-ovum (just barely visible to the naked eye); 7.5 micrometers-rbc (red blood cell)).
-vary in shape (flat, brick shaped, thread-like irregular shaped). |
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| Adult human body consists of about 70 trillion cells, at least 260 different varieties. |
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