| A | B |
|---|
| Unicellular organism | complete living thing consisting of only one cell |
| Multicellular organism | complete living thing composed of than one cell |
| Cell | smallest unit that can carry on all of the processes of life |
| Cell theory | the theory that all living things are made up of cells, that cells are the basic unit of life, and that cells only come from existing cells |
| Organelle | a cell component that performs specific functions in the cell |
| Nucleus | organelle which directs the activities of the cell |
| Eukaryotes | a cell that contains a nucleus and membrane bound organelles |
| Prokaryotes | a cell that lacks a nucleus and membrane bound organelles |
| Cell Membrane | the outer boundary of the cell and seperates the cell from its surrounding cells |
| Cytoplasm | jelly-like substance filing the cell and surrounding organelles |
| Selectively permeable membrane | allowing some things to pass through while keeping other things out. |
| Fluid mosaic model | model of the dynamic cell membrane |
| Cytoplasmic streaming | the circular motion of cytoplasm |
| Riosomes | the organelle where proteins are made |
| Endoplasmic reticulum | a membrane system of folded sacs and tunnels |
| Golgi apparatus | the processing, packaging, and secreting organelle of the cell |
| Mitochondria | large organelles that can grow, divide, or fuse with one another; the respiration system of the cell |
| Lysosomes | organelles that contain digestive enzymes |
| Microtubules | long slender protein tubes |
| Microfilaments | fine protein threads |
| Cytoskeleton | the framework of the cell |
| Spindle fibers | specialized microtubules |
| Cilia and flagella | two kinds of structures that extend out from the surface of the cell and function in movemonet |
| Nuclear envelope | double membrane surrounding the nucleus |
| Chromatin | the DNA and the proteins in the nucleus of a non-dividing cell |
| Chromosome | a strand of coiled up chromatin |
| Nucleolus | a spherical body in the center of the nucleus |
| Cell wall | in plant cells; surrounds the cell membrane and supports and protects the cell |
| Vacuoles | a fluid-filled cavity found in plant cells |
| Plastids | where food and/or pigments are stored |
| Middle lamella | inter-cellular glue between new cells |
| Chloroplasts | containing a green pigment called chlorophyll that absorbs light as the fist step of photosyntesis |
| Chromoplasts | synthesize and store pigments which function in trapping sunlight for energy |
| Leucoplasts | store food such as starches, proteins, and lipids |
| Tissue | group of cimilar cells that carry out a common function |
| Organ | Several types of tissue that interact to perform a specific function |
| Organ system | made up of a group of organs that work together to perform a set of related tasks |
| Colonial organism | a group of more or less similar cells that live together at a closely connected group |
