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bio ch 6 vocab
| Question | Answer |
|---|---|
| cell theory | the theory that organisms are composed of cells and their products and that these cells are all derived from preexisting cells |
| cel wall | a stiff covering around the plasma membrane of certain cells, as in plants, many algae, and some prokaryotes; in plants, the cell wall is constructed partly of cellulose |
| centriole | structure in animal cells and some others composed of cylinders of nine triplet microtubules in a ring; helps organize microtubule assembly during cell division |
| cilia | short, hairlike cell appendages specialized for locomotion and formed from a core of nine outer doublet microtubules and two inner single microtubules |
| colony | a distinct group of microorganisms growing together |
| cytoskeleton | a network of microtubules, microfilaments, and intermediate filaments that run throughout the cytoplasm of eukaryotic cells and serve a variety of mechanical and transport functions |
| cytosol | cytosol the gelatinlike portion of the cytoplasm that bathes the organelles of the cell |
| endoplasmic reticulum (ER) | an extensive membranous network in eukaryotic cells; composed of ribosomestudded (rough) and ribosome-free (smooth) regions |
| epidermis | the outer covering of animals and plants |
| eukaryote | an organism whose cells have a membraneenclosed nucleus and organelles; a protist, a fungus, a plant, or an animal |
| flagella | vision that uses both eyes at once; produces an appearance of solidity or depth because of the slightly different angle from which each eye views an object |
| Golgi apparatus | an organelle in eukaryotic cells consisting of stacked membranes that modify and package materials in vesicles for export from the cell |
| lysosome | a cell vesicle that contains digestive enzymes |
| nucleoid | a region in a prokaryotic cell consisting of a concentrated mass of DNA |
| nucleolus | a structure in the nucleus that synthesizes ribosomal RNA |
| nucleus | in atoms, the central core containing protons and neutrons; in eukaryotic cells, the membrane-bound organelle that houses the chromosomes |
| organ | organ an organized group of tissues that carries on a specialized function in a multicellular organism |
| organelle | an organized structure within a cell with a specific function |
| plasma membrane | the membrane at the boundary of every cell, which serves as a selective barrier to the passage of ions and molecules |
| plasmid | a small ring of DNA in bacteria that carries genes separate from those of the chromosome |
| prokaryote | an organism whose cells do not have membrane-enclosed nuclei or organelles; a moneran (bacterium) |
| ribosome | ribosome an organelle consisting of two subunits and functioning as the site of protein synthesis |
| system | a group of organs that interact to perform a set of related functions |
| tissue | a group of cells with a common function and structure |
| vacuole | a membrane-enclosed structure in the cytoplasm of a cell |
| vesicle | a small intracellular, membrane-enclosed sac that stores or transports substances |
Created by:
CassTrav
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