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Biology 14 Terms

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Term
Definition
Biogenesis   the theory that living organisms come only from other living organisms  
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Spontaneous Generation   an early and now disproved theory that living organisms come to life spontaneously from nonliving material  
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Radiometric Dating   a method of determining the absolute age of an object by comparing the relative percentages of a radioactive (parent) isotope and a stable (daughter) isotope  
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Isotope   an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)  
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Mass Number   the sum of the numbers of protons and neutrons in the nucleus of an atom  
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Radioactive Decay   the disintegration of an unstable atomic nucleus into one or more different nuclides, accompanied by the emission of radiation, the nuclear capture or ejection of electrons, or fission  
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Half-Life   the time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope  
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Microsphere   Spherical in shape and are composed of many protein molecules that are organized as membranes  
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Coacervate   a mass of colloidal substances held together by electrostatic attraction  
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Ribozyme   a type of RNA that can act as an enzyme  
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Archaea   Related group of unicellular organisms, many of which thrive under extremely harsh environmental conditions  
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Chemosynthesis   the production of carbohydrates through the use of energy from inorganic molecules instead of light  
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Cyanobacteria   a bacterium that can carry out photosynthesis, such as a blue-green alga  
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Endosymbiosis   a mutually beneficial relationship in which one organism lives within another  
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