Topic:ÿThe discovery of the biochemistry and photochemistry Description: [?] Preferred language style: English (U.S.) Second writing assignment (50 points); An analysis of the history of the discovery of the biochemistry and photochemistry of photosynthesis This assignment is due February 25 at midnight. The process of science involves making observation, generating testable hypothesis and the testing the hypothesis. If the hypothesis is rejected the process is repeated and even if the hypothesis is supported the results of the test suggest refinements to the hypothesis. The history of the elucidation of the biochemistry of photosynthesis provides a good illustration of this scientific process. Using chapters from Raven, Evert and Eichhorn (2005) ?Biology of Plants? (Chapter 7), Bonner and Galston (1952) ?Principles of Plant Physiology?, and Maximov (1938) ?Plant Physiology? as the source material for the state of understanding of photosynthesis in 1938, 1958 and 2005, write a paper describing how our understanding of carbon fixation has changed over time. Also describe how the availability of new scientific methods enabled new discoveries that changed our understanding of this process. Your paper should not be longer than 6 double-spaced pages. You can but are not required to use additional references. The chapters from Raven, Evert and Eichhorn (2005) , Bonner and Galston (1952) ?Principles of Plant Physiology?, and Maximov (1938) ?Plant Physiology? are accessed using linked in the assignment on Moodle. Your paper you should address the following: 1. Discuss the understanding of photosynthetic carbon assimilation (both biochemistry of what has become known as the Calvin Cycle and the source of energy for the cycle) at each of these times and how this understanding evolved over time. 2. Discuss the theoretical and experimental results underlying the hypotheses at each of these times. 3. Putting yourself into the mind of scientists of the time (1938 and 1952), do you find the hypotheses reasonable? 4. Discuss how experimentation caused the older hypotheses to be rejected and replaced by new hypotheses. 5. Finally, present your opinion on how likely the current hypotheses on photosynthesis are to stand up to further experimentations. Hints: 1. Do not consider C4 or CAM photosynthesis. 2. All of the chapters have information that is not relevant to the assignment. Ignore the material in each chapter that is not relevant to the fixation of carbon dioxide and the source of energy for this process. For example most of the relevant information in the Maximov chapter is in Section 43. I have provided links two versions of the chapter in the assignment on Moodle.
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