questions_for_discussion_3 - constantly allowing for the...

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Questions for Discussion Section 3 Name_Darren Pinder____________ Due at the beginning of section, 30 June. 1. In this paper, the author refers to Carl Sagan’s definition of life as “a localized region that increases in order through cycles driven by an energy flow.” What is one difference between this definition and other definitions of life seen in this class? Explain in one or two sentences. One difference is the reference to an area or region rather to a single unit or organism. Also this definition refers to the main component of life as a cycle or energy flow. In class we’ve discussed life as adhering to a list of characteristics such as: cell structure, adaptability, genetic programming and metabolism. 2. In one or two sentences (with equations, if necessary) relate the above definition of life to the laws of thermodynamics and/or the definition of Gibbs’ Free Energy. The above relates to both laws of thermodynamics. “…through cycles driven by an energy flow”, states that all energy is recycled and reused but never destroyed and is
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Unformatted text preview: constantly allowing for the increase of a population. 3. The type of proto-life proposed by the “metabolism first” model does not have a modern genome, a volume of code that specifies how to make an organism. What does it have, and how can it do the same job? The beginning for metabolism first most likely occurred with the primordial citric acid cycle. Here, in the reductive part, geologically produced high-energy electrons surrender energy to the cycle. Then, activated acetate product from the cycle enters into biosynthetic pathways. The activated acetate enters the oxidative citric acid cycle where there is a transfer of high energy electrons to energy-harvesting pathways as carbon dioxide is a waste product. 4. What is the limitation of the sort of genome proposed by the “metabolism first” model? a) it can not evolve b) it can not mix with others—there is no prebiotic sex c) it limits complexity d) it can not make copies of itself...
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This note was uploaded on 09/21/2011 for the course BIS 002A taught by Professor Unknown during the Summer '09 term at UC Davis.

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