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Bio Ch 14

Biology Chapter 14 Terms

TermDefinition
Biogenesis The scientific principal that living organisms come only from other living organisms.
Spontaneous generation An early and now disproved theory that living organisms come to life spontaneously from nonliving material.
Radiometric Dating A method of determining the absolute age of an object by comparing the relative percentages of a radioactive isotope and a stable isotope.
Isotope An atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons.
Mass Number The sum of the number of protons and neutrons in the nucleus of an atom.
Radioactive Decay The disintegration of an unstable atomic nucleus into one or more different nuclides, accomplished by the emission of radiation, the nuclear capture or ejection of electrons, or fission.
Radioactive Isotope An isotope that has an unstable nucleus and that emits radiation.
Half-life The time required for half of a sample of radioactive isotope to break down by radioactive decay to form a daughter isotope.
Microsphere A microscopic spherical structure composed of many proteins.
Coacervate A mass of droplets of colloidal substances, such as lipids, amino acids, and sugars, that are held together by electrostatic attraction.
Ribozyme A type of RNA that can react as an enzyme.
Archaea In a modern taxonomic system, a domain made up of prokaryotes that can live in extreme environments & that are differentiates from other prokaryotes by various important chemical differences; this domain aligns with the traditional kingdom Archaebacteria
Chemosynthesis The production of carbohydrates through the use of energy from inorganic molecules instead of light.
Cyanobacteria A group of bacteria that can carry out photosynthesis: formally called blue-green algae.
Ozone A gas molecules that is made up of three oxygen atoms.
Endosymbiosis A mutually beneficial relationship in which one organism lives within another: a theory that eukaryotic cells originated through endosymbiotic relationships between ancient prokaryotic cells.
Created by: GarciaC17