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17 Cards in this Set
- Front
- Back
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PROTOBIONT
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a collection of abiotically produced molecules surrounded by a membrane or membrane-like structure.
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RIBOZYME
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an RNA molecule that functions as an enzyme, catalyzing reactions during RNA splicing
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RADIOMETRIC DATING
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a method for determining the absolute ages of rocks and fossils, based on the half-life of radioactive isotopes
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HALF-LIFE
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the amount of time it takes for 50% of a sample of a radioactive isotope to decay
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GEOLOGIC RECORD
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the division of Earth's history into time periods, grouped into three eons-Archaean, Proterozoic, and Phanerozoic-and further subdivided into eras, periods and epochs
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STROMALITE
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layered rock that results from the activities of prokaryotes that bind thin films of sediment together
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ENDOSYMBIOSIS
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a process in which a unicellular organism engulfs another cell, which lives within the host cell and ultimately becomes an organelle in the host cell
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SERIAL ENDOSYMBIOSIS
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a hypothesis for the origin of eukaryotes consisting of a sequence of endosymbiotic events in which mitochondria, chloroplasts and perhands other cellular structures were derived from small prokaryotes that had been engulfed by larger cells
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CAMBRIAN EXPLOSION
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a relatively brief time in geologic history when large, hard-bodied forms of animals with most of the major body plans known today appeared in the fossil record. This burst of evolutionary change occurred about 535 - 525 million years ago
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CONTINENTAL DRIFT
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the slow movement of the continental plates across Earth's surface
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PANGEA
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the supercontinent that formed near the end of the paleozoic era, when plate movement brought all the landmasses of Earth together
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MASS EXTINCTION
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period of time when global environmental changes lead to the elimination of a large number of species throughout Earth
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ADAPTIVE RADIATION
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period of evolutionary change in which groups of organisms form many new species whose adaptations allow them to fill vacant ecological roles in their communities
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CLIMATE
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the long-term prevailing weather conditions at a locality
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MACROCLIMATE
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large-scale patterns in climate; the climate of an entire region
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MICROCLIMATE
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very fine scale patterns of climate, such as the specific climate conditions underneath a log
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TROPICS
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latitudes between 23.5 degrees north and south
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