Review session 5

Review session 5 - Review#5(aka eight days before Test 2...

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Review #5 2/21/07 (aka eight days before Test 2)
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WANT EXTRA CREDIT?? Check blackboard for an extra credit assignment This assignment is to be completed before Test 2 Will have to provide answers to yesterday’s PRS questions (written out) DO IT!
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Sat vs. Unsat Fatty Acids A cell membrane with more UNsat fatty acids is more fluid, because kinked tails make close packing dificult A cell membrane with more SAT fatty acids is more viscous Temp. can also affect the fluidity of cell membranes: COLD MORE FLUID(tight packing prevented) WARM MORE SOLID
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Opening PRS Questions A chemical reaction with a negative delta G is: 1. Spontaneous 2. Not spontaneous 3. Energy requiring 4. Not possible
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_______ loses a phosphate and becomes_____: 1. ADP; ATP 2. ATP; ADP 3. ANP; ATP 4. ATP; ATP
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Thermodynamics and Enzymes Chapter 8
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Energy Transformation All energy in solar system comes from sun Only plants can capture it 6 CO 2 + 6 H 2 O + e carbohydrates (C 6 H 12 O 6 ) + O 2 e = energy Radiant energy chemical bonds = stored chemical energy Energy is then used by being passed from one bond to another – within cell, within organism, between organisms Energy transformation is governed by two laws of thermodynamics
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Law of conservation of energy: energy can be converted/transferred from one form to another, but can never be destroyed or created. “the energy has to come from somewhere” The first law of thermodynamics CO 2 H 2 O Heat
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Second law of thermodynamics “in every physical or chemical change, the universe always moves towards greater disorder or randomness” The law of thermodynamic spontaneity Enthalpy = order Entropy = disorder= chaos For a process to occur without energy input, it must increase the entropy of the universe
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Free Energy (G): the energy that is free to do work Free energy change ( G ): G final state – G initial state 2200 G measures the spontaneity of the a chemical reaction A spontaneous reaction is one that results in a decrease of free energy ( G is negative value). This is also called an exergonic (energy-releasing) reaction. The opposite is an endergonic (energy-requiring) reaction. Enthalpy = order= high free energy Entropy = disorder= low free energy
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G = G f - G i A + B (100 kcal/mol) C + D (98 kcal/mol) + e 98 kcal/mol – 100 kcal/mol = -2 kcal/mole ( G) (a loss of energy) Any reaction that produced products that contain less free energy than the original reactants will proceed - - because, the released energy is enough to to drive the reaction and
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This note was uploaded on 06/15/2008 for the course BSC 2010 taught by Professor Pf during the Spring '08 term at FSU.

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Review session 5 - Review#5(aka eight days before Test 2...

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