BIOL 1201-Exam 1

BIOL 1201-Exam 1 - Biology 1201 - Test 1 Dr. Wischusen What...

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Biology 1201 --- Test 1 Dr. Wischusen What is Science? h A body of knowledge i An approach to understanding nature * What do Scientists do? h Make observations i Attempt to discern patterns i Assume that the future is like the past Scientific Method Observation Test Generalization or Model Predictions or Hypothesis *never going to reach 100% truth but come very close* What is Biology? h Study of life What is Life? h Characteristics of Living systems Organization** Energy Use** Development Reproduction** Evolve Respond to the Environment** **talked about in Biology 1201 Scale of Nature h What scales are biologists interested in? Atomic 10 -8 meters Community/Ecosystem 10 6 meters Approaches to Biology h Reductionist approach i Wholists approach i We are starting with the Reductionist Science Truth %
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Why is the atomic structure biologically important? h Organisms are composed largely of 11 basic elements i Value for an average human is $930.00 What determines solubility? h Like dissolves like i Like in terms of polarity Polar solutes dissolve in polar solvents Non polar solutes in non polar solvents Atom h Smallest unit of matter separable by normal chemical means i Smallest unit of matter that retains all the properties of the element **Electrons have a charge of what? -1 Subatomic Particles Particles Mass Electric Charge Proton Neutron Electron Atomic Number and Mass h Atomic number = the number of protons in an atom i Atomic mass = the number of protons and neutrons in an atom Valence h The number of electrons that need to be gained or lost to fill the outer shell of electrons i Valence also predicts the number of bonds that an atom will form. Hydrogen #1 Helium #2 Carbon #6 0N 1P N P 6N 6P 2N 2P k l K m
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Chemical Bonds h Form when atoms gain and lose or share electrons i They are the result of electrical attractions between atoms Ionic Bonds h Forms when electrons completely gain and lose i Strongest bonds when DRY Covalent Bonds h Forms when atoms share electrons i If shared equally covalent i If shared unequally polar covalent i Strongest bond in WATER -1 +1 What determines the number and type of chemical bonds? h Number = Valence i Type = Electronegativity Electronegativity h Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons i Measure the attraction of an atom has for electrons Hydrogen Bonds h Weak attractions between atoms on different molecules or different parts of a large molecule i Occur between molecules that have polar covalent to ionic bonds i Always involve Hydrogen Molecules and Compounds h Compound: a substance consisting of two or more different atoms, in specific proportions, bounded together in a specific pattern 0N 1P 0N 1P 0N 1P 0N 1P 0N 1P 0N 1P 0N 1P 0N 1P neutral
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Molecule: the smallest unit of a compound that retains all the properties of the compound Molecular Formulas
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This note was uploaded on 12/07/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Fall '07 term at LSU.

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BIOL 1201-Exam 1 - Biology 1201 - Test 1 Dr. Wischusen What...

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