7th Gr. Science Ch. 4
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Created by:
resourceteacher on May 16, 2011
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17 terms
Terms | Definitions |
|---|---|
 cell | basic unit of a living organism that can perform all the processes associated with life |
| cell theory | a set of statements that describe the basic concepts about cells |
| cell membrane | the thin structure, made mostly of proteins and lipids, that encloses the cytoplasm and nucleus of plant and animal cells |
| cell wall | the stiff structure outside the cell membrane in a plant; provides support for the cell. |
| nucleus | the control center for most of a cell's activities |
| cytoplasm | a jellylike substance that makes up all the living material in a cell except tha nucleus |
| organelle | a tiny part of a cell having a special form and function; it carries out all life processes |
| chloroplast | an organelle in plant cells that contains chlorophyll |
| chlorophyll | green pigment in plants that captures the sun's energy for photosynthesis |
| tissue | a group of specialized cells in plants and animals that are organized to perform a certain function |
| organ | a group of tissues that work to perform a special function |
| mitochondria | an organelle that produces energy in a cell |
| ribosome | an organelle that produces protein for the cell |
| endoplasmic reticulum | an organism that transports materials throughout a cell |
| Golgi body | an organelle that manufactures and moves materials within a cell; materials that are transported by the endoplasmic reticulum stop first at this organelle where they are altered or stored before moving to other parts of the cell or expelled through the plasma membrane |
| lysosomes | an organelle that breaks down food molecules, waste products, and old cells |
| vacuole | an organelle that stores water, food, and wastes in a cell and helps get rid of wastes |
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