 Do enzymes change activation energy,  G, or both?

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Concept 2.5 – Intro to Energy Be able to distinguish between kinetic and potential energy o Kinetic – E of Motion o Potential – E at rest, due to position Metabolism = ____________ + ____________ o Catabolism + Anabolism Be able to distinguish between exergonic and endergonic chemical reactions o Exergonic – release energy, - delta G o Endergonic – requires energy, + delta G Explain the First and Second law of Thermodynamics, in your own words o First: E cannot be created or destroyed o Second: Entropy (level of chaos/disorder) – always increasing Differentiate between processes that are undergoing increases in entropy vs. those undergoing decreases in entropy o Progression of Entropy – Most-Least – Gas-Liquid-Solid Chapter 3 - Enzymes Define enzyme o Enzyme – substance that catalyzes a chemical rxn by decreasing activation energy Be able to define activation energy – be able to identify it on a reaction diagram o Activation E – Distance between Peak E and equilibruim Define Free Energy (G) o Gibbs Free Energy – E available to do work Be able to identify exergonic and endergonic chemical reactions by looking at the “Change in Free Energy” value, G. o (-) Delta G – Exergonic o (+) Delta G - Endergonic Do enzymes change activation energy, G, or both?
Does the value of G tell you how fast the reaction will go?
Be able to define substrate
What is the importance of the weak/temporary bonds that form between the enzyme & substrate in the “enzyme-substrate (ES) complex?”
What does “induced fit” mean in terms of enzyme-to-substrate interactions?
What additional things do enzymes do to help reduce the activation energy of a chemical reaction?
What are “cofactors?”
Enzyme regulation can be accomplished by changing the _____ or the _____ of an enzyme. Which method is faster?

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