01:119:115 Lecture Notes - Lecture 46: Exergonic Reaction, Joule, Metabolic Pathway
5 Apr 2016
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Compare and contrast the difference/explain catabolic and anabolic reactions. Identify and compare and contrast enzymes and enzyme functions. Sum off all chemical reactions of an organism. An emergent property of life arises from orderly interactions between molecules. A metabolic pathway begins with a specific molecule and ends with a product. Each step is catalyzed by a specific enzyme. Potential energy=stored e has not yet been used. Heat (thermal energy): random movement of atoms or molecules. 2nd law: every e transfer or transformation the entropy (disorder) of the universe. Light e enters an ecosystem and heat e exit. Cells 40% efficient, rest is heat. Total e available to do work is decreasing over time. Ultimate source of e radiant e (the sun) Cell needs e to do: mechanical work (movement, transport work (active mb transport, chemical work (breaking bonds) Forms of e in cells: potential e: stored in covalent bonds of molecules, kinetic e: released when bonds are broken.
