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Unformatted text preview: The Chemical Nature of Life
• Like the abiotic world, living organisms are a collection of atoms (representing different elements) that are linked by chemical bonds to form molecules. • Unique to life, are the myriad of molecules primarily comprised of one or more of these four elements: carbon, hydrogen, oxygen & nitrogen
body wt. – comprise 96% of body weight
– 4%: Ca, K, S, Na, P, Mg, Cl – Trace elements (0.01%): I, Fe, Co, Zn, B, Mn, Se, • Emergent properties: atoms → molecules, example: 2H + O2 → H2O; properties of elements O, H vs. that of water. Atomic Structure ATOMS
HAVE SUBATOMIC PARTICLES
a. determine located in: b. atomic number d. g. combine to get e. located in h. shells constant for each may differ in various outer shell called c. f. isotopes i. Atomic Structure
The element helium
electrons: (–) charge; # electrons = # protons
protons: (+) charge & neutrons (uncharged)
atomic mass • Isotopes of an atom: different number of neutrons (prot...
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This note was uploaded on 08/16/2011 for the course BIOL 1361-1362 taught by Professor Any during the Spring '08 term at University of Houston.
- Spring '08