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16 Cards in this Set
- Front
- Back
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archaebacteria
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a paryotic organism distinguished from other prokaryotes by the composition of the cell membranes and walls
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biogenesis
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the theory that living things only come from other living things (life comes from other life)
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chemosynthesis
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the production of carbohydates through the use of energy from inorganic molecules instead of light
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coacervate
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a cell like substance formed from droplet formed from dissimilar substances
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cynobacteria
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photosynthetic unicellular prokaryotes
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endosymbiosis
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a mutualy beneficial relationship between one organism and another that lives within it
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half-life
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the period of time in which half of a radioactive substance decays
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isotope
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one of multiple forms of a chemical element that had a different number of neutrons than other atoms of that element
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mass number
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the sum of the protons and teh neutrons in an atom
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microsphere
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a type of microscopic droplet enclosed by a membrane composed of organic molecules
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ozone
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a molecule composed of three atoms of oxygen; sheilds earth from ultraviolet rays
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radioactive dating
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a method of determining the age of an object by measuring the amount of a specific radioactive isotope it contains
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radioactive decay
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the release of patricles or radiant energy by the unstable nuceli of some isotopes
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radioactive isotope
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an isotope with an unstable nucleus
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ribozyme
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a type of RNA that is able to act as an enzyme
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spontaneous generation
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an early and now disproved hypothesis that living organisms develop from nonliving material
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