BIOL 1020 Lecture 13: October 3rd 2014.docx
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BIOL 1020 Full Course Notes
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Did you get it: a short answer question . Describe the free energy changes involved in endergonic and exergonic reactions. How do enzymes affect these reactions: a chemical reaction that has a g of +3. 5 kcal/mol. It is an exergonic reaction: the activation energy is 3. 5 kcal/ mol. B: the reactants have 3. 5 kcal/mol energy, the products have 3. 5 kcal/mol energy, the reaction requires a net input of 3. 5 kcal/mol. Some enzymes work in forward and reverse directions. There are different forms of some enzymes that assist different reactions. Regulation of enzyme activity: activity: total amount of reactant converted to product (over time, number of enzyme molecules: genes, activity of each enzyme molecule, ph, temp etc, concentrations of substrates and products, inhibitors and activators. Factors that affect enzyme activity: cofactors help enzymes, non-protein enzyme helpers, organic cofactor is called a coenzyme e. g. vitamins inorganic (such as a metal in ionic form, eg magnesium needed for hexokinase, forms complex with atp.