molecules_of_life

molecules_of_life - Molecules of Life Chapter 3 Outline...

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Molecules of Life Chapter 3
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Outline Molecules and life Water Carbon based molecules Hydrocarbons Carbohydrates Lipids Proteins Nucleic acids
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Water
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Water properties Unique properties based on its structure Oxygen is more electronegative than hydrogen Electrons spend more time with oxygen than with hydrogen Polar covalent bond ie unequal sharing
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Water Properties Unique properties based on its polarity Oxygen more electronegative than hydrogen results in unequal sharing of electron Slight polar ends
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Polarity of Water causes stickiness
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Water Structure Water molecules  stick  to each other in distinct patterns  resulting in organization of molecules 
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Why is polarity important? Polarity causes molecules to interact in unique ways that influence life Encourages formation of hydrogen bonds
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Effects of Polarity on Water s Properties Capillary action Moderation of temperature High specific heat High heat of vaporization Density properties Solvent properties
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Cohesion Water molecules tendency to stick to each other Forms hydrogen bonds in 3-d Results in surface tension
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Surface Tension Why is surface tension important…
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Surface Tension in Biology http://www.visionlearning.com/library/module_viewer.php?mid=57 Jesus Lizard
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Surface Tension in Biology
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Surfactants Molecules that disrupt cohesion amongst water molecules
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Surfactants Don t wash your car in the creek or dump soap down the storm wash!
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Adhesion Water molecules tendency to stick to other polar molecules
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Cohesion Adhesion
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Capillary Action Cohesion & Adhesion
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Water Transport
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Terminology Heat= amount of energy associated with the movement of atoms and molecules in matter Temperature= measures the intensity of heat
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High specific heat H bonds retard motion at atomic level Water High specific heat Stabilize temperatures » Keeps your body temperature stabilized » Keeps environmental temperature stabilized
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molecules_of_life - Molecules of Life Chapter 3 Outline...

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