Collections of abiotically produced molecules surrounded by a membrane-like structure.

An RNA molecule that functions as an enzyme, catalyzing reactions during RNA splitting.

A method for determining the absolute ages of rocks and fossils, based on the half-life of radioactive isotopes.

The time it takes for 50% of a sample of a radioactive isotope to decay.

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.

Layered rock that results from the activities of prokaryotes that bind thin films of sediment together.

Refers to the hypothesis that mitochondria and plastids were formally small prokaryotes that began living within larger cells.

A sequence of endosymbiotic events in which mitochondria, chloroplasts, and other cellular structures were derived from small prokaryotes that had been engulfed by larger cells.

A brief time in history when large, hard-bodies forms of animals with most of the major body plans known today appeared in the fossil record.

The slow movement of the continental plates across Earth's surface.

The supercontinent that formed near the end of the Paleozoic era, when plate movements brought all the landmasses of Earth together.

Period of time when global environmental changes lead to the elimination of a large number of species throughout Earth.

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.

Evolutionary change in the timing or rate of an organism's development.

The retention in an adult organism of the juvenile features of its evolutionary ancestors.

Any of the master regulatory genes that control placement and spatial organization of body parts in animals, plants, and fungi by controlling their developmental fate of groups of cells.

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Bio: Chapter 25

Term	Definition
Protobionts	Collections of abiotically produced molecules surrounded by a membrane-like structure.
Ribozymes	An RNA molecule that functions as an enzyme, catalyzing reactions during RNA splitting.
Radiometric Dating	A method for determining the absolute ages of rocks and fossils, based on the half-life of radioactive isotopes.
Half-life	The time it takes for 50% of a sample of a radioactive isotope to decay.
Geologic Record	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.
Stromatolite	Layered rock that results from the activities of prokaryotes that bind thin films of sediment together.
Endosymbiosis	Refers to the hypothesis that mitochondria and plastids were formally small prokaryotes that began living within larger cells.
Serial Endosymbiosis	A sequence of endosymbiotic events in which mitochondria, chloroplasts, and other cellular structures were derived from small prokaryotes that had been engulfed by larger cells.
Cambrian Explosion	A brief time in history when large, hard-bodies forms of animals with most of the major body plans known today appeared in the fossil record.
Continental Drift	The slow movement of the continental plates across Earth's surface.
Pangaea	The supercontinent that formed near the end of the Paleozoic era, when plate movements brought all the landmasses of Earth together.
Mass Extinction	Period of time when global environmental changes lead to the elimination of a large number of species throughout Earth.
Adaptive Radiations	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.
Heterochrony	Evolutionary change in the timing or rate of an organism's development.
Paedomorphosis	The retention in an adult organism of the juvenile features of its evolutionary ancestors.
Homeotic Gene	Any of the master regulatory genes that control placement and spatial organization of body parts in animals, plants, and fungi by controlling their developmental fate of groups of cells.

Created by: Gianna B

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