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Lesson 4

Characteristics of Life

TermDefinition
Cell The basic unit of structure and function for all living things
Unicellular One-celled (uni meaning "one"). Bacteria, viruses, and protists are considered unicellular
Multicellular An organism composed of many cells
Species A group of organisms that have similar characteristics and can breed with each other to produce offspring that are fertile
Asexual Reproduction The ability to reproduce without the exchange of genetic material from another organism. An example would be an organism splitting in half to create two completely identical organisms
Budding A form of asexual reproduction in which the organism begins to grow an exact duplicate of itself on its own surface. The new organism eventually breaks off and becomes and independent organism
Sexual Reproduction Requires two organisms that contribute cells that combine to form a new organism. Each offspring will then have traits from both parents and not genetically identical
Phototropism The movement of a stationary organism (such as a plant) toward a source of light
Stimulus A factor that causes a response from an organism. Light, temperature, odor, etc. are examples
Homeostasis The process by which a living organism keeps and maintains internal conditions so they are constant, despite changes in the organism’s external environment
Metabolism The balance of chemical reactions in the body of an organism
Catabolism The process of breaking down food into simple compounds
Anabolism The process of building complex compounds from simple compounds
Created by: ecotteacher
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