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ch 4 sec 3
chapter 4 section 3 terms
| Question | Answer |
|---|---|
| phosphilipid bilayer | a double layer of phospholipids that makes up plasma and organelle membranes |
| chromosome | in a eukaryotic cell, one of the structures in the nucleus that are made up of DNA and protein; in a prokaryotic cell, the main ring of DNA |
| nuclear envelope | the double membrane that surrounds the nucleus of a eukaryotic cell |
| nucleolus | the part of the eukaryotic nucleus where ribosomal RNA is synthesized |
| ribosome | a cell organelle composed of RNA and protein; the site of protein synthesis |
| mitochondrion | in eukaryotic cells, the cell organelle that is surrounded by two membranes and that is the site of cellular repiration, which produces ATP |
| endoplasmic reticulum | a system of membranes that is found in a cell's cytoplasm and that assists in the production, processing, and trtansport of proteins and in the production of lipids |
| Golgi apparatus | a system of flattened, membranous sacs |
| lysosome | a cell organelle that coontains digestive enzymes and that buds from the Golgi apparatus |
| cytoskeleton | the cytoplasmic network of protein filaments and tubes that plays an essential role in cell movement, shape, and division |
| microfilament | a fiber found inside eukaryotic cells that is composed mainly of the protein actin and that has a role in cell structure and movement |
| cilium | a hairlike structure arranged in tightly packed rows that projects from the surface of some cells |
| flagellum | a long, hairlike structure that grows out of a cell and enables the cell to move |
| centriole | an organelle that is composed of two short microtubes at right angles to each other and that has an active role in mitosis |