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16 Cards in this Set
- Front
- Back
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archaebacteria
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a prokaryotic 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 organisms come only from other living
organisms |
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chemosynthesis
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the production of carbohydrates through the use of energy
from inorganic molecules instead of light |
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coacervate
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a cell-like droplet formed from dissimilar substances
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cyanobacteria
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photosynthetic unicellular prokaryotes
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endosymbiosis
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a mutually beneficial relationship between one organism and
another that lives within it; the hypothesis of endosymbiosis relating to the evolution of eukaryotes that holds that chloroplasts and mitochondria evolved from endosymbiotic bacteria |
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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 has 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 the 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; ozone in the upper
atmosphere shields the Earth from ultraviolet radiation |
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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 particles or radiant energy by the unstable
nuclei 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 |
