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15 Cards in this Set
- Front
- Back
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radioactive dating
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Methods of establishing the age of materials include the technique known as RADIOACTIVE DATING.
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isotopes
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Atoms of the same element thet differ in the number of neutrons they contain are called ISOTOPES.
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Mass Number.
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The MASS NUMBER
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Mass Number
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The MASS NUMBER of an isotope is the total number of protons and neutrons in the nucleus.
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Radioactive Decay
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Some isotopes have unstable nuclei, which tend to undergo RADIOACTIVE DECAY.
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Radioactive Isotopes
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Their nuclei tend to release particles or radiant energy, or both. Such isotopes are called RADIOACTIVE ISOTOPES.
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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 is called its HALF-LIFE.
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Microspheres
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The structures include MICROSPHERES, which organized as a membrane.
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Coacervates
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COACERVATES which are collections of droplets that are composed of molecules of different types, including linked amino acids and sugars.
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Ribozyme
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Cech used the term RIBOZYME for an RNA molecule that can act as an enzyme and promote a specific chemical reaction.
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archaebacteria
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If we look for living organisms that may be similar to these early organisms, we find the ARCHAEBACTERIA.
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Chemosynthesis
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In the process of CHEMOSYNTHESIS, CO2 serves as a carbon source for the assembly of organic molecules.
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Cynabobacteria
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CYANOBACTERIA is a group of photosynthetic unicelluar prokaryotes.
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Ozone
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OZONE is poisionous to both plant and animal life, but in the uppper atmoshpere, a layer of OZONE absorbs intense ultraviolet radiation from the sum.
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Endosymbiosis
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ENDOSYMBIOSIS, it is thought that the aerobic prokaryote eventually gave rise to modern mitochondria, which are he site of aerobic resperation in eukaryotic cells.
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