25 - LECTURE 25 ANNOUNCEMENTS THIS WEEK'S ASSIGNMENTS(FOR...

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LECTURE 25 ANNOUNCEMENTS FRIDAY’S LECTURE BIOENERGETICS: CONCENTRATION GRADIENTS INFLUENCE THE GIBBS FUNCTION! ELECTRICAL POTENTIAL DIFFERENCE INFLUENCES THE GIBBS FUNCTION: MUST BE CONSIDERED FOR ION TRANSPORT ACROSS MEMBRANES TODAY: REDOX REACTIONS ARE SPECIAL . WHY?! METABOLISM. CONNECTIONS AMONG RXNS. WHY CELLS USE GLUCOSE. THIS WEEK 'S ASSIGNMENTS (FOR QUIZ 11/3): AS IN LG FOR 10/27 AND 10/29 EXCEPT MOVE ONE HOMEWORK PROBLEM TO NEXT WEEK : Ch15#4 AND NO PyMOL ASSIGNMENT FOR THIS WEEK (NO PyMOL ON 11/3 QUIZ). INTRO TO REDOX RXNS DID ANYONE FIND A BLACK WALLET IN BAKER AFTER THE MIDTERM EXAM THURSDAY NIGHT? LOST BY A BIOCHEM STUDENT-- LET PROF KNOW
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ROLE OF e - IN CAUSING RXNS TO OCCUR IN BIOLOGY CH 3 CHO + 2e - + 2H + CH 3 CH 2 OH NAD + + H + + 2e - NADH START: LIGHT "RAISES e - LEVEL" OF CHLOROPHYLL; NEW STATE: REDUCING AGENT THEN, RXNS OCCUR: SYN. OF NADPH & ATP; AND H + PUMPED ACROSS MEMBRANE OUR GOAL NOW: PUT THIS “RAISING e - LEVEL” INTO THE LANGUAGE OF DRIVING CHEMICAL RXNS, i.e. G lll l l l l I Z Z IN PHYSICS TREAT e - FLOW IN TERMS OF VOLTS, OHMS, CAPACITANCE, RESISTANCE WITHOUT EXPLICIT DISCUSSION OF CHEMISTRY IN BIOCHEMISTRY, e - FLOW MORE COMPLICATED: MUST NOTICE CHEMISTRY OF EVERY e - MOVEMENT EACH STEP: e - LOST FROM ONE MOLECULE, e - GAINED BY ANOTHER MOLECULE TRANSFER OF e - DEPENDS ON CHEMICAL PROPERTIES OF THE MOLECULE THAT LOSES e - (THIS MOLECULE BECOMES OXIDIZED) AND THE MOLECULE THAT GAINS e - (THIS MOLECULE BECOMES REDUCED) TRANSFER OF e - DEPENDS SEPARATELY-- IN AN ADDITIVE WAY -- ON THE CHEMICAL PROPERTIES OF EACH MOLECULE OVERALL: CH 3 CHO + NADH + H + CH 3 CH 2 OH + NAD + OF THIS HALF RXN = - 0.197V E o OF THIS HALF RXN = - 0.320V E o NET ( ) = + 0.123V E o E o OK, NOW WHAT TO DO WITH THIS VOLTAGE , + 0.123V?!
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