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Unformatted text preview: centriole (sen tree ole) A paired organelle that helps organize the microtubules in animal and protist cells during nuclear division. cilium (sil ee um) (plural: cilia) [L.: eyelash] Hairlike organelle used for locomotion by many unicellular organisms and for moving water and mucus by many multicellular organisms. Generally shorter than a flagellum. collagen [Gk. kolla : glue] A fibrous protein found extensively in bone and connective tissue. cytoskeleton The network of microtubules and microfilaments that gives a eukaryotic cell its shape and its capacity to arrange its organelles and to move. endomembrane system Endoplasmic reticulum plus Golgi apparatus; also lysosomes, when present. A system of membranes that exchange material with one another. endoplasmic reticulum (ER) [Gk. endo : within + L. plasma : form + L. reticulum : net] A system of membranous tubes and flattened sacs found in the cytoplasm of eukaryotes. Exists in two forms: rough ER, studded with ribosomes; and smooth ER, lacking ribosomes. ER, studded with ribosomes; and smooth ER, lacking ribosomes....
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- Spring '08