bio 202 exam 1 study guide(2)

bio 202 exam 1 study guide(2) - F Radioactive isotopes in...

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F. Radioactive isotopes in biology a. determining the age of samples: radioactive elements have specific and constant periods of decay called “half-life” which can range from seconds to thousands of years (14C= 5715 years, 32P=2weeks, 8C= 2EE-21 seconds) b. cytotoxic and mutagenic (genotoxic) agents (therapeutics, sterilization) c. biological tracers: metabolic labelling of biological molecules (DNA, proteins, etc) with isotopes and following their fate in a cell or organism. d. radioactive isotopes also serve as biological tracers for diagnostics chemical behavior of atoms depends on its electron configuration “octet rule” electron shell: layered groups of electrons around the nucleus valence electrons: located in the outermost shell of an atom noble gas: an element with a full outer electron shell 6. Structure of Molecules and Compounds A. Chemical Bonds a. form due to attraction between atoms b. hold compounds together c. can also result from the attraction of opposite charges between atoms d. valence: an atom’s capacity to bond; equal to the number of unpaired electrons in the
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  • Spring '08
  • dean
  • Biology, Atom, Electrons, Chemical bond, polar covalent bond

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