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Bio Vocab Chapter 4
Biology Vocabulary Chapter 4
| Term | Definition |
|---|---|
| cell | a membrane-bound structure that is the basic unit of life. |
| cell membrane | the lipid bilayer that forms the outer boundary of the cell. |
| cell theory | states that (1) all living things are made up of cells, (2) cells are the basic unit of organisms, and that (3) cells come only from existing cells. |
| cell wall | a rigid structure that surrounds to cells of plants, fungi, many protists, and many bacteria. |
| chloroplast | a plastid containing clorophyl; the site of photosynthesis. |
| chromatin | the DNA and proteins in the nucleus of a dividing cell. |
| chromosome | DNA and protein in a coiled, rod shaped form that occurs during cell division. |
| cilium | a short, hairlike organelle that extends from a cell and functions in locamotion or in the movement of substances across the cell surface. |
| cytoplasm | the region of a cell between the cell membrane and the nucleus. |
| cytoskeleton | a network of long protein strands in the cytosol that helps maintain the shape and size of a eukaryotic cell. |
| eukaryote | a cell that contains a nucleus and membrane-bound organelles. |
| flagellum | a hairlike structure made up of microtubules that function in locamotion. |
| membrane | the lipid layer that forms the outside of the cell. |
| nucleus | the organelle that contains most of the DNA and directs most of the cell’s activity. |
| prokaryote | a unicellular organism that lacks a nucleus and membrane-bound organelles. |
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