chemistry of life part ii -chemical reactions -enzymes -water
DESCRIPTION
Chemistry of Life Part II -Chemical Reactions -Enzymes -Water. Enzymes – catalysts or “biological wedges”. Activation Energy – the necessary energy input to jumpstart a reaction. Energy-Releasing Reaction. Energy-Absorbing Reaction. Activation energy. Products. Activation energy. - PowerPoint PPT PresentationTRANSCRIPT
Chemistry of LifePart II
-Chemical Reactions-Enzymes
-Water
Enzymes – catalysts or “biological wedges”Activation Energy – the necessary energy input to jumpstart a reaction
Energy of ReactionsEnergy-Absorbing Reaction Energy-Releasing Reaction
Products
Products
Activation energy
Activation energy
Reactants
Reactants
Endothermic Exothermic
Enzymes:-Regulate chemical pathways-Make materials that cells need-Release energy
Enzyme Video
• http://www.youtube.com/watch?v=CZD5xsOKres&feature=related
H20
Slight Negative Charge
Slight Positive Charge
Water’s Polarity
• 2 polar ends attract each other
• A weak bond between the H of one atom and the O of another in water (or any electroneg…)
• H20 can hydrogen bond with 4 other H20 molecules
hydrogen bonding-the attraction between water molecules
Properties of WaterUniversal Solvent-due to its polarity
-Salts, sugars, acids, bases-Hydrophobic vs hydrophilic
Cohesion Causes Surface Tension
Adhesion (Capillary Action)
http://discovermagazine.com/2003/mar/featscienceofhttp://www.sciencebuddies.org/science-fair-projects/project_ideas/PlantBio_p033.shtml
Dehydration synthesis- build up by removing water
Hydrolysis-break down by adding water
GOOD LUCK!!!