Bio Sec 1-1 Vocab
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Created by:
rachelzafren on August 25, 2010
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19 terms
Terms | Definitions |
|---|---|
 organism | a living thing |
| biology | the study of life and all living things |
| cell | the basic unit of life |
| unicellular | containing one cell |
| multicellular | composed of more than one cell |
| differentiations | when multicellular organisms become different from each other as they multiply and follow various rolls |
| homeostatis | having stable internal conditions, found in all living things including single cells |
| reproduction | when an organism produces another organism like itself by giving their offspring hereditary information |
| DNA | hereditary information passed along during reproduction. |
| gene | a short segment of DNA that contains the instructions for the development of a single trait of an organism |
| sexual reproduction | when hereditary information from two parts of a single organism or from two organisms of the same species are combined |
| evolve | to change |
| the theory of evolution | explains how organisms today are related to those that lived in the past |
| natural selection | theory in which organisms with favorable traits are better able to successfully reproduce than those that lack those traits |
| ecology | branch of biology that studies how organisms interact with each other and their surroundings |
| ecosystems | environmental communities |
| photosynthesis | process through which plants and some unicellular organisms capture energy from the sun and change it into a form of energy that can be used in living things |
| autotrophs | organisms such as plants that obtain their energy by making their own food by converting water and carbon dioxide into energy rich substances such as sugars and starches |
| heterotrophs | organisms that must take in food to meet their energy needs-this includes all animals and fungi in addition to some unicellular organisms and plant species |
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