5-Energy - Energy Energy and Biosynthesis 1 2 3 4 5 Dr Beth...

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1 1 Energy and Biosynthesis Dr. Beth Dawson BIO 3, Fall 2010 San José State University 2 Energy 1. Energy 2. Reaction coupling 3. Redox reactions 4. Metabolism 5. Activated carriers 3 Energy • Capacity to do work, cause change • Different forms • Transform 4 5 Energy • First law of thermodynamics Campbell’s Biology Figure 8.3 Energy can be but can not be created nor destroyed. The chemical energy in food will be converted to the kinetic energy of the cheetah’s movement. (a) Chemical energy 6 Energy • Second law of thermodynamics Campbell’s Biology Figure 8.3 Every energy transformation increases the disorder (entropy) of the universe. Disorder is added to the cheetah’s surroundings in the form of heat and the small molecules that are the by-products of metabolism. (b) Heat co 2 H 2 O +
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2 7 Energy • Entropy and heat 8 Energy • Does life violate the 2nd law of thermodynamics? – No – Input of energy from Sun 9 Free Energy • Delta G, Δ G – Measure of change in free energy • Endergonic – Require input of energy, consumes energy • Exergonic – Releases energy 10 Free Energy Exergonic Δ G < 0 Endergonic Δ G > 0 11 Free Energy 12 Free Energy ATP -> ADP + Pi Exergonic Increases entropy
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3 13 Exergonic Δ G < 0 – Negative Δ G
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5-Energy - Energy Energy and Biosynthesis 1 2 3 4 5 Dr Beth...

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