biology-keystone u1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 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
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| cell wall | -rigid structure providing support for cell
-thicker than the cell membrane
-inflexible
-protects the cell and gives the cell its shape
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| cytoplasm | -jelly-like substance filling intracellular space
-contains dissolved substances
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| cyto-skeleton | -network of fine tubes and threads
-provides internal structural support
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| centrioles | -paired rods
-help organize microtubules during mitosis
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| nucleus | membrane-bound structure containing cells' genetic information and support molecules
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| nucleolus | -small structure within nucleus
-site of production of ribosomal RNA
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| nuclear membrane | -boundary between nucleus and cytoplasm
-regulates passage of materials between the two
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| flagella, pili, cilia | -structures used to enable movement of cells or sometimes to propel substances across outer surface of cell
-predominantly protein in composition
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| mitochondria | -membrane bound organelle
-folded membranes contain enzymes for aerobic respiration
-little DNA
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| chloroplasts | -membrane bound organelle
-folded membranes contain chlorophyll and enzymes for photosynthesis
-little DNA
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| vacuole | -membrane bound area filled with water and assorted solutes
-role in maintenance of water balance of the cell
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| ribosomes | -small organelles at which protein synthesis occurs
-may be free floating or membrane bound
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| smooth ER | -network of flattened membranes forming tunnels
-enzymes assisting synthesis of some lipids
-final processing of proteins
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| rough ER | -ribosomes embedded in membrane
-proteins to be exported from cell produced here
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| Golgi body | -stacks of saucer shaped membranes where export proteins are modified and stored prior to entering secretory vesicles for exocytosis
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| lysosomes | -membrane bound structure
-contains enzymes, which break down toxic or unwanted molecules
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| plastids | membrane bound structures with varied functions
-leucoplasts=starch storage
-chromo lasts=colored pigments within
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| vesicles | -packages for storage
-temporary transport associated with endocytosis/exocytosis
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Created by:
amandathornton
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