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16 Cards in this Set

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  • Back
archaebacteria
a prokaryotic organism distinguished from other prokaryotes
by the composition of the cell membranes and walls
biogenesis
the theory that living organisms come only from other living
organisms
chemosynthesis
the production of carbohydrates through the use of energy
from inorganic molecules instead of light
coacervate
a cell-like droplet formed from dissimilar substances
cyanobacteria
photosynthetic unicellular prokaryotes
endosymbiosis
a mutually beneficial relationship between one organism and
another that lives within it; the hypothesis of endosymbiosis relating to the
evolution of eukaryotes that holds that chloroplasts and mitochondria evolved
from endosymbiotic bacteria
half-life
the period of time in which half of a radioactive substance
decays
isotope
one of multiple forms of a chemical element that has a different number
of neutrons than other atoms of that element
mass number
the sum of the protons and the neutrons in an atom
microsphere
a type of microscopic droplet enclosed by a membrane composed
of organic molecules
ozone
a molecule composed of three atoms of oxygen; ozone in the upper
atmosphere shields the Earth from ultraviolet radiation
radioactive dating
a method of determining the age of an object by measuring
the amount of a specific radioactive isotope it contains
radioactive decay
the release of particles or radiant energy by the unstable
nuclei of some isotopes
radioactive isotope
an isotope with an unstable nucleus
ribozyme
a type of RNA that is able to act as an enzyme
spontaneous generation
an early and now disproved hypothesis that living
organisms develop from nonliving material