09MetabolismandThermodynamics-1

09MetabolismandThermodynamics-1 - BSC 2010 Biological...

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Unformatted text preview: BSC 2010 Biological Science I Spring 2009 Lecture Topic 9: Metabolism and Thermodynamics Metabolism The sum total of all the chemical reactions that occur in an organism. Metabolic reactions and pathways: Catabolic Anabolic Catabolic pathways release energy by breaking down complex molecules into simpler compounds. Cellular respiration, the breakdown of glucose in the presence of oxygen, is an example of a catabolic pathway. C 6 H 12 O 6 + 6O 2 6 CO 2 + 6 H 2 O + energy (This is the overall reaction, keep in mind that it is not a one step process.) Anabolic pathways consume energy to build complex molecules from simpler ones. (Ag a in, this is no t a o ne s te p pro c e s s ) 6 CO 2 + 6 H 2 O + energy C 6 H 12 O 6 + 6 O 2 The synthesis of glucose by plants during photosynthesis is an example of an anabolic process. An organisms metabolism transforms matter and energy. To understand metabolism, need to understand matter and energy. Potential energy is energy that matter possesses because of its location or structure. Kinetic energy is energy associated with motion. Energy is the capacity to cause change. It exists in two main forms: He a t , whic h is a s s o c ia te d with the ra ndo m m o ve m e nt o f a to m s o r m o le c ule s , is a fo rm o f kine tic e ne rg y. In bio lo g ic a l s ys te m s , po te ntia l e ne rg y is m o s tly in the fo rm o f c he m ic al e ne rg y . Ene rg y is s to re d in the b o nds tha t ho ld a to m s to g e the r. 6 CO 2 + 6 H 2 O + energy C 6 H 12 O 6 + 6 O 2 Photosynthesis Cellular respiration C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O + energy Lots of steps involving the transfer of energy and transformation of energy (and matter) from one form to another Governed by the laws of thermodynamics sunlight Chemical energy (a form of potential energy) Chemical, kinetic, heat; various forms used by cells Chemical energy (a form of potential energy) The First Law of Thermodynamics Energy can be transferred or transformed from one form to another, but it cannot be created or destroyed....
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09MetabolismandThermodynamics-1 - BSC 2010 Biological...

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