Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 14, Problem 2TQ
Summary Introduction
To review:
The environment that favors oxygenic photosynthesis and sulfur phototrophy.
Introduction:
Oxygenic photosynthesis is a process in which water acts as the initial electron donor and molecular oxygen gets liberated in the form of a byproduct. Sulfur phototrophy is a form of anoxygenic photosynthesis carried out by a group of green sulfur bacteria that are obligate anaerobe photoautotrophs.
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Green sulfur bacteria are able to generate which of the following inorganic product molecules during anoxygenic photosynthesis?
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hydrogen sulfide
Green sulfur bacteria are able to generate which of the following inorganic product molecules during anoxygenic photosynthesis?
elemental sulfur
glucose
C6H12O6
oxygen
hydrogen sulfide
Chapter 14 Solutions
Microbiology: An Evolving Science (Fourth Edition)
Ch. 14.1 - Prob. 1TQCh. 14.1 - Prob. 2TQCh. 14.2 - Prob. 1TQCh. 14.2 - Prob. 2TQCh. 14.2 - Prob. 3TQCh. 14.3 - Prob. 1TQCh. 14.3 - Prob. 2TQCh. 14.3 - Prob. 3TQCh. 14.4 - Prob. 1TQCh. 14.5 - Prob. 1TQ
Ch. 14.5 - Prob. 2TQCh. 14.6 - Prob. 1TQCh. 14 - Prob. 1RQCh. 14 - Prob. 2RQCh. 14 - Prob. 3RQCh. 14 - Prob. 4RQCh. 14 - Prob. 5RQCh. 14 - Prob. 6RQCh. 14 - Prob. 7RQCh. 14 - Prob. 8RQCh. 14 - Prob. 9RQCh. 14 - Prob. 10RQCh. 14 - Prob. 11RQCh. 14 - Prob. 1TQCh. 14 - Prob. 2TQCh. 14 - Prob. 3TQCh. 14 - Prob. 4TQ
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- DRAW a curved arrow mechanism for photosynthesis with the following steps. Step 1: Absorption of sunlight and excitation of chlorophyll molecules Step 2: Transfer of energy to reaction center chlorophylls, which lose an electron and become oxidized. Step 3: Electron transfer from oxidized chlorophylls to an electron acceptor, such as a quinone molecule Step 4: Electron transfer from the quinone molecule to a chain of electron carriers, such as cytochromes, which generate a proton gradient across the thylakoid membrane Step 5: ATP synthesis by ATP synthase using the energy of the proton gradient. Step 6: Transfer of electrons from the electron carriers to the enzyme rubisco, which catalyzes the carboxylation of ribulose bisphosphate (RuBP) with CO2, forming an unstable 6-carbon intermediate. Step 7: Cleavage of the 6-carbon intermediate into two 3-carbon molecules, which are phosphorylated by ATP and reduced by NADPH to form glyceraldehyde-3-phosphate (G3P) Step 8: Conversion of G3P to…arrow_forwardProchlorococcus marina, one of the smallest prokaryotes capable of oxygenic photosynthesis, uses which of the following inorganic substrate molecules during photosystem II of photosynthesis? hydrogen sulfide diatomic oxygen elemental sulfur carbon dioxide glucosearrow_forwardGenerally, increasing the concentration of carbon dioxide increases the rate of photosynthesis. What conditions could prevent this effect?arrow_forward
- Tell me why the authors put this photosynthesis equation here. What do you think is its main purpose for the process of photosynthesis by an equation?arrow_forwardWhat is the process of damaging of photosynthetic pigments at very high temperature?arrow_forwardThe purple sulfur bacteria using PSII produce reducing power (i.e. NADH) during the light reactions of photosynthesis by what process? a) The reverse TCA cycle b) The Calvin cycle c) Cyclic photophosphorylation d) Reverse electron flowarrow_forward
- Why is only 1 out of 100 chlorophylls attached to the electron transport chain? does the chlorophyll attached to the electron transport chain differ from the others?arrow_forwardWhich of the following statements about the light reactions of photosynthesis are correct? 1. Absorption of light does one thing: it makes chlorophyll easier to oxidize. 2. In PSII, the rate of damage to the D1 protein can never exceeds the rate of repair. 3. Electron transport is spontaneous (exergonic) as electrons move from P680* to P700+. 4. Compared to anoxygenic photosynthesis, in oxygenic photosynthesis less light needs to be absorbed to reduce NADP+. A. 1,2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1,2,3 and 4 are correctarrow_forwardTypically the CO2 necessary for photosynthesis enters through the stomata of the plant leaves suppose petroleum jelly was used to coat the leaves out of this tomato blocked or closed a) what effect will this have on the light reactions in these leaf cells b) what effect will this have on the Calvin cycle in these leaf cellsarrow_forward
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