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Week 3 Study Tool
Cells and Tissues
| Term | Definition |
|---|---|
| cells | smallest living organism |
| cell theory | scientific theory describing the properties of cells |
| generalized cell | cell that is round or spherical in shape and perform basic life functions |
| nucleus | the control center of a cell that contains genetic material |
| nuclear envelope | the double lipid bilayer membrane that surrounds the genetic material and nucleolus |
| nuclear pores | large protein complexes that cross the nuclear envelope |
| nucleoli | Dense spherical bodies in the cell nucleus |
| chromatin | Structures in the nucleus that carry genes |
| chromosomes | barlike bodies of tightly coiled chromatin |
| plasma membrane | membrane, composed of three lamina layers, that encloses cell contents |
| hydrophilic | has an affinity for water |
| hydrophobic | having little to no affinity for water |
| tight junctions | junctions that form the closest contact between adjacent cells |
| desmosomes | a type of junction that attaches one cell to its neighbor |
| gap junction | connections between cells which allow passage of small molecules and electric current |
| cytoplasm | the cellular material surrounding the nucleus and enclosed by the plasma membrane |
| cytosol | the liquid component of the cytoplasm surrounding the organelles |
| organanelles | small cellular structures that perform specific metabolic functions for the cell as a whole. |
| inclusions | a foreign substance enclosed in the mass of a mineral |
| mitochandria | cytoplasmic organelles responsible for ATP generation for cellular activities |
| ribisomes | cytoplasmic organelles in which proteins are synthesized |
| edoplasmic reticulum | a network of tubular membranes within the cytoplasm of the cell |
| rough ER | a eukaryotic organelle made up of a system of membranous tubes and sacs, that is studded with ribosomes on its surface |
| transports vesicles | a round membranous structure that stores and transports cellular products, and digests metabolic wastes within the cell |
| smooth ER | a part of the endoplasmic reticulum that is tubular in form and lacks ribosomes |
| Golgi | an organelle found in most eukaryotic cells |
| secretory vesicles | membrane bounded vesicle derived from the Golgi apparatus |