Vocabulary
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each of the black spaces below before clicking
on it to display the answer.
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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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radioactive isotope | an isotope that has an unstable nucleus and that emits radiation
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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 | a microscopic spherical structure composed of many protein molecules that are organized as a membrane.
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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 | prokaryotes (most of which are known to live in extreme environments) that are distinguished from other prokaryotes by differences in their genetics and in the makeup of their cell wall; members of the domain Archaea (singular, archaeon)
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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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ozone | a gas molecule that is made up of three oxygen atoms
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endosymbiosis | a mutually beneficial relationship in which one organism lives within another
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