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Unit 1: Cells
7th Grade Science
| Term | Definition |
|---|---|
| cell | all living things are made of cells, which are the smallest unit that is said to be alive. |
| cell membrane | forms the boundary that controls what enters and leaves |
| cell theory | all organisms are composed of one or more cells. |
| cell wall | gives structure to plant cells. |
| chloroplast | site of photosynthesis in plant cells |
| nucleus | directs the cell's activities. |
| organelle | differentiated structure within a cell that performs a specific function. |
| Cytoplasm | Fluid that surrounds the organelles |
| Mitochondria | Converts energy from food into energy a cell can use |
| Organ | A group of tissues that perform a specific function or group of functions |
| Organ System | A group of organs that work together to perform a specific function or group of functions |
| Tissue | A group of cells in an organism that have similar structure and function |
| Vacuole | Storage area for cells; water storage in plants |
| Robert Hooke | used to word cell in 1665; looked at a thin slice of cork (plant cell) under the microscope. |
| Heterotrophs | consumers; cannot make their own food; must consume other living organisms. |
| Autotrophs | producers; make their own food |
| cyclosis | the movement of materials inside a cell. |
| respiration | breaking down glucose into simpler substances and releasing the stored energy in a form the cell can use. |
| biosynthesis | using the energy from foods to form new cell parts, as in growth and repair. |
| excretion | the removal of liquid waste from the cell. |
Created by:
jwolff
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