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TEKS 7.12
levels of organization, cell structures, cell theory
Term | Definition |
---|---|
cell | the smallest structural and functional unit of an organism |
tissue | a group of cells working together to perform a specialized function |
organ | a group of tissues that work together to perform specific job |
organ system | a group of organs that are working together for a specific function |
organism | any living thing |
organelle | a membrane bound structure inside of a cell that has a specific job |
nucleus | a membrane-bound structure in eukaryotic cells, the 'brain' of the cell, controls cellular activity and contains the DNA |
cell wall | A tough, protective barrier that surrounds the outer membrane of some types of cells. |
cell membrane | A lipid barrier that encloses the cytoplasm and controls what enters and exits the cell. |
cytoplasm | the jelly-like substance contained within the cell membrane that fills the cell and holds the organelles in place |
chloroplast | an organelle found only in plant cells, site of photosynthesis |
mitochondrion | the power factory of the cell, source of energy production |
vacuole | A large, water filled organelle present in all plant and fungal cells and some animal and bacterial cells. |
cell theory | first stated by Matthias Schleiden and Theodor Schwann in 1838–39, that cells are the basic units of structure and function in living organisms. |
autotroph | any organism capable of self-nourishment by using photosynthesis as a source of energy, most plants |
heterotroph | capable of utilizing only organic materials as a source of food. |
unicellular | single celled organisms; examples - bacteria, amoeba, paramecia |
multicellular | organisms made of many cells; examples - plant, frog, tiger, onion, human |
lysosome | An organelle that contains enzymes capable of breaking down many types of molecules. |
photosynthesis | A chemical reaction during which plants convert radiant energy from the Sun to chemical energy; the reaction converts carbon dioxide and water into sugar (glucose). 6CO2 + 6O2 ------------> C6H12O6 + 6O2 |
cellular respiration | The process of obtaining energy from the breaking of chemical bonds in nutrients. Cell Food + O2 ---------> ENERGY + CO2 |