24 - LECTURE 24 ANNOUNCEMENTS: MAKE-UP MIDTERM EXAM: SUNDAY...

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LECTURE 24 ANNOUNCEMENTS: MAKE-UP MIDTERM EXAM: SUNDAY 10/23 1 - 3:30PM in BIOTECH. GRADING HAS BEGUN ON THE MIDTERM EXAM…. TODAY: WEDNESDAY'S LECTURE : INFLUENCE OF CONCENTRATION AND ELECTRIC FIELD ON FREE ENERGY: BIG! DON'T FORGET: PyMOL ASSIGNMENT ON CARBOHYDRATES FOR WED QUIZ 10/26 THE "CONCENTRATION CELL", A RXN DRIVEN JUST BY CONC DIFFERENCE "BIOENERGETICS" INTRO TO REDOX RXNS IN METABOLISM REDOX REACTIONS ARE SPECIAL . WHY?! METABOLISM. CONNECTIONS AMONG RXNS. WHY CELLS USE GLUCOSE.
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1. STABILITY OF REACTANTS vs STABILITY OF PRODUCTS ( G o ) 2. CONCENTRATIONS OF REACTANTS vs PRODUCTS 3. FOR IONS: ELECTRICAL POTENTIAL ACROSS MEMBRANES 4. REDOX POTENTIALS 4 FACTORS CONTROL TENDENCY OF CHEMICAL RXNS TO OCCUR: ( ENZYMES CONTROL RATE OF ANY BIOCHEMICAL RXN, INCLUDING LEAVING THE RATE ~ 0)
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WHAT IS INTERESTING ABOUT REDOX REACTIONS? MANY REDOX RXNS OCCUR SPONTANEOUSLY, e.g RUST O2 + 4 e- + 2 H2O 4 OH- Fe Fe2+ + 2 e 4 Fe2+ + O2 4 Fe3+ + 2 O2 Fe2+ + 2 H2O Fe(OH)2 + 2 H+ Fe3+ + 3 H2O Fe(OH)3 + 3 H+ BUT WHEN REDOX RXNS OCCUR IN LIVING CELLS: 1. PROTEINS CONTROL THE REACTION 2. “SPECIAL” SMALL MOLECULES ARE INVOLVED (!)
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REDOX RXNS: QUANTITATION VIA GIBBS FUNCTION G = G + RTln[PRODUCTS]/[REACTANTS] G = - n F E where n = NUMBER OF e - IN RXN AS WRITTEN G = - n F E o ' + E o ' O O o ' ' o ' ' OF HALF RXN#1 AS WRITTEN OF HALF RXN#2 AS WRITTEN
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This note was uploaded on 01/01/2012 for the course BIOMG 3310 taught by Professor Feigenson during the Fall '11 term at Cornell University (Engineering School).

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24 - LECTURE 24 ANNOUNCEMENTS: MAKE-UP MIDTERM EXAM: SUNDAY...

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