| A | B |
|---|
| cell | a membrane-bound structure that is the basic unit of life |
| cell membrane | the lipid bilayer that forms the outer boundary of a cell |
| cell theory | the theory that all living things are made up of cells, that cells are the basic units of organisms, and that cells come only from existing cells |
| eukaryote | a cell that contains a nucleus and membrane-bound organelles |
| nucleus (in a eukaryotic cell) | the organelle that contains most of the DNA and controls most of the cell's activities |
| organelle | one of several formed bodies with a specialized function that is suspended in the cytoplasm and found in eukaryotic cells |
| prokaryote | a unicellular organism that LACKS a nucleus and membrane-bound organelles |
| cell wall | a rigid structure that surrounds the cells of plants, fungi, many protists, and most bacteria |
| chloroplast | a plastid containing chlorophyll; the site of photosynthesis |
| cytoplasm | the region of a cell between the cell membrane and the nucleus |
| cytoskeleton | a network of long protein strands in the cytosol that helps maintain the shape and size of a eukaryotic cell |
| cytosol | the gelatinlike aqueous fluid that bathes the organelles on th inside of the cell membrane |
| endoplasmic reticulum | a system of membranous tubules and sacs in eukaryotic cells that functions as a path along which molecules move from one part of the cell to another |
| fluid mosaic model | a model of cell membrane structure representing the dynamic nature of membrane lipids and proteins |
| golgi apparatus | a system of membranes in eukaryotic cells that modifies proteins for export by the cell |
| lysosome | an organelle containing digestive enzymes, existing primarily in animal cells |
| mitochondrion | the organelle that is the site of aerobic respiration in eukarytoic cells (glucose is converted to ATP) |
| ribosome | an organelle that functions in the synthesis of proteins |
| rough endoplasmic reticulum | the portion of the ER that contains attached ribosomes and makes proteins |
| smooth endoplasmic reticulum | the portion of the endoplasmic reticulum that LACKS attached ribosomes; makes lipids and detoxifies drugs |
| vacuole | a fluid-filled organele that stores enzymes or metabolic wastes in a plant cell |
| colonial organism | a collection of genetically identical cells that live together in a closely connected group |
| organ | several types of body tissues that perform together a specific function |
| organ system | a group of organs that interact to perform a set of related tasks |
| tissue | in most multicellular organisms, a group of similar cells that carry out a common function |
