What is reverse electron transport utilized for in species (for example, purple sulfur bacteria) that employ...
What is reverse electron transport utilized for in species (for example, purple sulfur bacteria) that employ it? Why is it needed?
Homework Answers
Reverse electron transfer is a mitochondrial signaling pathway and also plays a mechanism in microbial metabolism. The redox state of the CoQ pool determines electron leak and superoxide production and can be used by mitochondria as a signaling mechanism. The energy is supplied by consuming proton motive force to drive electrons in a reverse direction through an electron transport chain
It is needed in purple bacteria which lack external electron carriers to spontaneously reduce NADP+ to NADPH, so they have to use their reduced quinones to reduce NADP+. This process is driven by the proton motive force and is called reverse electron flow.
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What is reverse electron transport utilized for in species (for
example, purple sulfur bacteria) that employ...
Why might green sulfur bacteria be able to out-compete purple sulfur bacteria for their common substrate,...
Why might green sulfur bacteria be able to out-compete purple sulfur bacteria for their common substrate, sulfide? Presume light is not limiting for either organism
What is reverse electron transport? What enzyme(s) are involved, and what is the essential action that...
What is reverse electron transport? What enzyme(s) are involved, and what is the essential action that takes place?
Overall electron flow in a cell using reverse electron transport Consider a cell that is using...
Overall electron flow in a cell using reverse electron transport Consider a cell that is using reverse electron transport to generate NADH and is not (for the moment) using the proton gradient for anything else. Assume the cell is not a phototroph (so electrons are not being recycled by light-driven pumping). Also assume that the proton gradient is produced solely by a Q-cycle like the one we've discussed, which pumps 2 protons per electron transferred. (This would imply that the...
Need help with a-e 1.) The photosystem of purple bacteria absorbs light at 870 nm. (a...
Need help with a-e
1.) The photosystem of purple bacteria absorbs light at 870 nm. (a (3 pts) Calculate the energy of one mole of photons (1 einstein) of light 1 - 870 nm. (b) ( 3 pts) How many moles of ATP under standard conditions could be theoretically synthesized using this energy? (c) (3 pts) Does this photosystem evolve Oz? Why or Why not? (d) (3 pts) The purple bacteria photoreaction center catalyzes the following reaction: 2 Cycz(Fe)+Q+ 2H...
Which of the following species accept electrons within the mitochondrial electron transport chain? Choose any/all answers...
Which of the following species accept electrons within the mitochondrial electron transport chain? Choose any/all answers that apply. A. NADH B. FMN-containing flavoproteins C. ubiquinone D. iron/sulfur centers E. molecular oxygen
Which statement regarding phototrophs is correct? a. Green sulfur bacteria appear green because their bacteriochlorophylls absorb...
Which statement regarding phototrophs is correct? a. Green sulfur bacteria appear green because their bacteriochlorophylls absorb green light. b. The proton motive force generated during photosynthesis in purple bacteria generates reducing power. c. Electron flow in oxygenic photosynthesis generates both cellular energy and precursor metabolites d. Electron carriers associated with FeS-type photosystems achieve higher reduction potentials than in Q-type photosystems. e. None of the above. Which statement regarding autotrophy is incorrect? a. A single turn of the Calvin Cycle fixes...
7. In certain species of plants, mutations can cause the electron transport chain connecting PSII to...
7. In certain species of plants, mutations can cause the electron transport chain connecting PSII to PSI to flip orientation. This change in orientation causes the electron transport chain to become ordered in terms of decreasing electronegativity instead of increasing electronegativity. What portions of photosynthesis will be affected by this change in the orientation of the electron transport chain? Why? 8. A mutation in the genome of a plant prevents proper folding of rubisco. How would this impact the Calvin...
Multiple Choice Cellular respiration and photosynthesis each employ an electron transport chain. Which statement below do...
Multiple Choice Cellular respiration and photosynthesis each employ an electron transport chain. Which statement below do the two electron transport gains not have in common? a.They both generate a proton (H+) gradient across a membrane b.They both involve redox reaction s c.They both occur in plant cells d.They both are embedded within a membrane e.Each of the above is shared by each electron transport chain Why do linear chromosomes become shorter each time DNA replication occurs? a.The leading strand cannot...
12. Explain how citric acid cycle Is connected to the electron transport chain. what is the...
12. Explain how citric acid cycle Is connected to the electron transport chain. what is the role of molecular oxygen (O2) for citric acid cycle? why will blocking the electron transport chain halt the citric acid cycle?
Which of the following best describes what occurs during the electron transport chain? The diffusion of...
Which of the following best describes what occurs during the electron transport chain? The diffusion of H+s provides the energy needed to make electrons move through the electron transport chain. Once the electrons reach oxygen, ATP is produced. O An H+ gradient is used to place oxygen at the end of the electron transport chain. The oxygen then pulls electrons towards it, which results in the synthesis of ATP. The energy of moving electrons is used to generate a proton...
Overall electron flow in a cell using reverse electron transport Consider a cell that is using reverse electron transport to generate NADH and is not (for the moment) using the proton gradient for anything else. Assume the cell is not a phototroph (so electrons are not being recycled by light-driven pumping). Also assume that the proton gradient is produced solely by a Q-cycle like the one we've discussed, which pumps 2 protons per electron transferred. (This would imply that the...
Need help with a-e
1.) The photosystem of purple bacteria absorbs light at 870 nm. (a (3 pts) Calculate the energy of one mole of photons (1 einstein) of light 1 - 870 nm. (b) ( 3 pts) How many moles of ATP under standard conditions could be theoretically synthesized using this energy? (c) (3 pts) Does this photosystem evolve Oz? Why or Why not? (d) (3 pts) The purple bacteria photoreaction center catalyzes the following reaction: 2 Cycz(Fe)+Q+ 2H...
7. In certain species of plants, mutations can cause the electron transport chain connecting PSII to PSI to flip orientation. This change in orientation causes the electron transport chain to become ordered in terms of decreasing electronegativity instead of increasing electronegativity. What portions of photosynthesis will be affected by this change in the orientation of the electron transport chain? Why? 8. A mutation in the genome of a plant prevents proper folding of rubisco. How would this impact the Calvin...
Which of the following best describes what occurs during the electron transport chain? The diffusion of H+s provides the energy needed to make electrons move through the electron transport chain. Once the electrons reach oxygen, ATP is produced. O An H+ gradient is used to place oxygen at the end of the electron transport chain. The oxygen then pulls electrons towards it, which results in the synthesis of ATP. The energy of moving electrons is used to generate a proton...
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