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15 Cards in this Set
- Front
- Back
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biogenesis
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states that all living things come from other living things.
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spontaneous generation
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believed to be the process where living things could also arise from nonliving things.
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radioactive dating
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a method of establishing the age of materials.
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isotopes
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Atoms of the same element that differ in the number of neutrons they contain.
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mass number
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the total number of protons and neutrons in the nucleus.
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radioactive decay
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the process that unstable nuclei undergo.
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radioactive isotopes
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their nuclei tend to release particles or radiant energy, or both.
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half-life
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The length of time it takes for one-half of any size sample of an isotope to decay.
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microspheres
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spherical in shape and are composed of many protein molecules that are organized as a membrane.
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coacervates
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are collections of droplets that are composed of molecules of different types, including linked amino acids and sugars.
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archaebacteria
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kingdom of unicellular organisms, many of which thrive under extremely harsh environmental conditions.
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chemosynthesis
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CO2 serves as a carbon source for the assembly of organic molecules. Energy is obtained from the oxidation of carious inorganic substances, such as sulfur.
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cyanobacteria
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a group of photosynthetic unicellular prokaryotes.
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ozone
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absorbs intense ultraviolet radiation from the sun.
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endosymbiosis
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thought that aerobic prokaryote eventually gave rise to modern mitochondria, which are the site of aerobic respiration in eukaryotic cells.
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