biology- chapter 3
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14 terms
Terms | Definitions |
|---|---|
 cell theory | This says that all living things are made of cells, that cells are the basic unit of structure and function and that cells only come from other cells. |
| cytoplasm | a jellylike fluid inside the cell in which the organelles are suspended |
| organelle | are structures specialized to perform distinct processes within a cell. |
| prokaryotic cell | a type of cell that do not have a nucleus or other membrane-bound organelles and they are microscopic single-celled organisms. |
| eukaryotic cell | a type of cell with a membrane-enclosed nucleus and membrane-enclosed organelles. |
| cell membrane | forms a boundary between a cell and the outside environment and controls the passage of materials into and out of a cell. |
| phospholipid | is a molecule composed of 3 basic parts: a charged phosphate group, glycerol and 2 fatty acid chains |
| fluid mosaic model | model that describes the arrangement and movement of the molecules that make up a cell membrane |
| selective permeability | a property of cell membrane which means it allows some, but not all, materials to cross. |
| receptor | protein that detects a signal molecule and performs an action in response |
| active transport | drives molecules across a membrane from a low concentration to a higher concentration. |
| endocytosis | is the process of taking liquids or fairly large molecules into a cell. |
| phagocytosis | is a type of endocytosis in which the membrane engulfs large particles. |
| exocytosis | the opposite of endocytosis is the release of substances out of a cell by the fusion of a vesicle. |
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