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15 Cards in this Set

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