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Lecture 11

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Wilfrid Laurier University
Matthew Smith

Clicker question answers:  Entropy decreases as substance changes from liquid into solid  Entropy of system + surroundings (universe) always increases  Rate of forward and reverse reactions are equal when reaction reaches equilibrium  Exergonic reactions have a -ve deltaG value (spontaneous reaction)  Endergonic have +ve deltaG value  Cellular respiration is example of catabolic pathway  Photosynthesis is example of anabolic pathway  ATP o Adenosine triphosphate o ATP hydrolysis releases free energy that can be used as source of energy for cell o Hydrolysis of ATP involves the removal of a phosphate group (Pi); releases energy (exergonic); this energy can be used to drive endergonic reactions  -7.3 kcal/mol = amount of energy released from the hydrolysis of 1 ATP molecule o Three main components: nucleotide base (adenine), ribose sugar, triphosphate group (three phosphates; -ve charge; tend to slightly repel each other) linked to 5' C of ribose sugar  ATP slightly unstable due to -vely charged phosphate that tend to repel each other  ATP is an unstable and high energy molecule  Anabolic and metabolic pathways use ATP; ALL organisms
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