Lect_8_notes - Bio 1A Lecture 8 Energy Enzymes Prof...

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Bio 1A Lecture 8 Energy & Enzymes Prof. Schlissel Feb 8, 2008 Energy and Enzymes 1. What do cells use energy for—motility, synthesis & degradation, cell growth & division, pumping molecules across membranes, sending signals, etc., etc. 2. Types of energy—potential, kinetic, chemical 3. Thermodynamics— First law: Energy can be neither created or destroyed Second law: When energy changes form, losses are inevitable. Entropy (disorder) of the Universe always increases. 4. Equilibrium and equilibrium constant (K eq ). Biology doesn’t happen at equilibrium, but important aspects of how organisms use energy require an understanding of equilibrium. 5. Exergonic and endergonic reactions give off or require energy. 6. Gibbs Free Energy equation: Δ G= Δ H –T Δ S. H=enthalpy (potential energy), T=temperature, and S=entropy. Δ G is negative for reactions which release energy (exergonic) and positive for those which require energy (endergonic).
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