| Question | Answer |
| cell membrane (plasma membrane) | -boundary between intracellular and extracellular environments
-regulates entry/exit of substances
-flexible and allows the cell to vary its shape if necessary
-helps maintain a chemical balance within the cell |
| cell wall | -rigid structure providing support for cell
-thicker than the cell membrane
-inflexible
-protects the cell and gives the cell its shape |
| cytoplasm | -jelly-like substance filling intracellular space
-contains dissolved substances |
| cyto-skeleton | -network of fine tubes and threads
-provides internal structural support |
| centrioles | -paired rods
-help organize microtubules during mitosis |
| nucleus | membrane-bound structure containing cells' genetic information and support molecules |
| nucleolus | -small structure within nucleus
-site of production of ribosomal RNA |
| nuclear membrane | -boundary between nucleus and cytoplasm
-regulates passage of materials between the two |
| flagella, pili, cilia | -structures used to enable movement of cells or sometimes to propel substances across outer surface of cell
-predominantly protein in composition |
| mitochondria | -membrane bound organelle
-folded membranes contain enzymes for aerobic respiration
-little DNA |
| chloroplasts | -membrane bound organelle
-folded membranes contain chlorophyll and enzymes for photosynthesis
-little DNA |
| vacuole | -membrane bound area filled with water and assorted solutes
-role in maintenance of water balance of the cell |
| ribosomes | -small organelles at which protein synthesis occurs
-may be free floating or membrane bound |
| smooth ER | -network of flattened membranes forming tunnels
-enzymes assisting synthesis of some lipids
-final processing of proteins |
| rough ER | -ribosomes embedded in membrane
-proteins to be exported from cell produced here |
| Golgi body | -stacks of saucer shaped membranes where export proteins are modified and stored prior to entering secretory vesicles for exocytosis |
| lysosomes | -membrane bound structure
-contains enzymes, which break down toxic or unwanted molecules |
| plastids | membrane bound structures with varied functions
-leucoplasts=starch storage
-chromo lasts=colored pigments within |
| vesicles | -packages for storage
-temporary transport associated with endocytosis/exocytosis |
