| A | B |
|---|
| cytoskeleton | the cytoplasmic network of protein filaments that plays an essential role in cell movement, shape, and division |
| ribosome | a cell organelle comoposed of RNA and protein; the site of protein synthesis |
| nucleus | in a eukaryotic cell, a membrane-bound organelle that contains the cell's DNA and that has a role in processes such as growth, metabolism, and reproduction |
| mitochondrion | in eukaryotic cells, the cell organelle that is surrounded by two membranes and that is the site of cellular respiration, which produces ATP |
| chloroplast | an organelle found in plant and algae cells where photosynthesis occurs |
| cell theory | the theory that states that all living things are made up of cells, that cells are the basic units of organisms, that each cell in a multicellular organism has a specific job, and that cells come only from existing cells |
| cell membrane | a phospholipid layer that covers a cell's surface and acts as a barrier between the inside of a cell and the cell's environment |
| golgi apparatus | cell organelle that helps make and package materials to be transported out of the cell |
| cytoplasm | the region of the cell within the membrane that includes the fluid, the cytoskeleton, and all of the organelles except the nucleus |
| electron microscope | a microscope that focus a beam of electrons to magnify objects |
| lysosome | a cell organelle that contains digestive enzymes |
| eukaryote | an organism made up of cells that have a nucleus enclosed by a membrane, multiple chromosomes, and a mitotic cycle |
| light microscope | a microscope that uses a beam of visible light passing through one or more lenses to magnify an object |
| central vacuole | a large cavity or sac that is found in plant cells or protozoans and that contains air or partially digested food |
| lipid bilayer | the basic structure of a biological membrane, composed of two layers of phospholipids |
| endoplasmic reticulum | a system of membranes that is found in a cell's cytoplasm and that assists in the production, processing, and transport of proteins and in the production of lipids |
| organelle | one of the small bodies that are found in the cytoplasm of a cell and that are specialized to perform a specific function |
| cilium | a hairlike structure arranged in tightly packed rows that projects from the surface of some cells |
| cell wall | a rigid struccture that surrounds the cell membrane and provides support to the cell |
| flagellum | a long, hairlike structure that grows out of a cell and enables the cell to move |
