Science chpt 4
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Created by:
sharismith on November 20, 2009
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18 terms
Terms | Definitions |
|---|---|
 organism | a complete living thing |
| life span | a process of birth, growth, reproduction, and death |
| environment | surroundings |
| energy | ability to do work |
| microscope | an instrument that uses lenses to magnify objects |
| unicellular | a one celled organism |
| multicellular | a living thing made up of more than one cell |
| chlorophyll | a green pigment in the chloroplasts of plant cells |
| cell membrane | cell's external boundary |
| chloroplast | plant cell structure that holds the green pigment |
| chromosomes | DNA bundles |
| cytoplasm | jelly like substance inside the cell membrane |
| endoplasmic reticulum | cell's transportation system |
| mitochondria | cell engines; break down food and release energy |
| nucleus | large circular structure containing DNA |
| ribosomes | make the proteins that the cell needs |
| vacuoles | bubble like storage organelles |
| cell theory | all living things are made of cells |
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