BIOL 2303 Lecture Notes - Lecture 7: Phototroph, Oxidative Phosphorylation, Phosphorylation
2 Nov 2020
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Document Summary
Microbes have a huge diversity of metabolic strategies: energy sources, carbon sources, redox capacities. This is why we see bacteria and archaea found in a variety of different extreme environments: we can also harness this diversity for human uses. Breaking open carbon bonds in glucose is done in a step-wise fashion. The electrons in bonds involving hydrogen in glucose have a lot of potential to fall . Cellular respiration controls this fall so that energy can be harvested out of the process: this happens instead of the energy being released all at once. To alternative strategies for energy conservation in chemoorganotrophs. Fermentation: anaerobic; organic compounds as the electron acceptors and donors. Respiration: anaerobic or aerobic; organic compound donor, oxygen (or other) acceptor (anaerobic) Pyruvate: instead of being converted to fermentation products, can be oxidized completely to carbon dioxide. Aerobic respiration: uses oxygen as terminal electron acceptor. Step 2: pyruvate oxidation and citric acid cycle.
