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Biol 101 15 January 2008

Biol 101 15 January 2008 - Biol 101 15 January 2008 Atomic...

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Biol 101 15 January 2008 Atomic behavior and bonding o Electrons Carry a negative charge Repel one another Are attracted to protons in the nucleus Move in orbitals – volumes of space that surround the nucleus o Electron vacancies Unfilled shells make atoms likely to react H, C, O, and N all have vacancies in their outer shells o Chemical bookkeeping Use symbols for elements when writing formulas Formula for glucose is C6H12O6 6 carbons 12 hydrogens 6 oxygens Chemical equation shows reactions: reactants products Ex: Equation for photosynthesis o Major organic molecules (organic = having to do with life, carbon-based) - Cells are complicated, but they are made up of smaller components Carbohydrates (CHO) Function: Common energy storage Molecules: sugars and starches Glucose (6-carbon ring structure) (monomer) (two or more monomers create a polymer: glucose + fructose sucrose)
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Glycogen, cellulose, chitin (polymers) , starch – least complicated [the more complicated a molecule is, the more energy is stored in it; for easy storage,
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