MIC 140 quiz_1 - carbon can go to biomass rather than any...

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Quiz 1. A. Define the metabolic mode of a photoheterotroph; i.e. what is it? A photoheterotroph is an organism that obtains, from the environment, its energy (e donor for ATP synthesis) as light, thereby generating an internal electron donor, and its carbon as a reduced carbon compound of greater or equal to 2 C units in length. B. Briefly defend whether this metabolic mode is or is not growth competitive in the environment. You can use schematics or equations in your argument. If reduced carbon compounds (organic carbon) and light are present then this metabolic mode is highly growth competitive, perhaps the most competitive. This is because all of the reduced
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Unformatted text preview: carbon can go to biomass rather than any of it be oxidized in a mechanism to produce ATP. However, if reduced carbon is not available, the metabolic mode of photoautotroph is no more competitive than an organoheterotroph. Conversely, many photoheterotrophs can also grow as a photoautotroph. Thus, in the absence of organic carbon, a phototroph could grow using CO 2 as the carbon source as an autotroph, providing a suitable electron donor is present in the environment to reduce the oxidized reaction center....
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