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biology-ks cell part
biology-keystone u1
| 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 |
Created by:
amandathornton
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