Prescott's Microbiology
10th Edition
ISBN: 9781259281594
Author: Joanne Willey, Linda Sherwood Adjunt Professor Lecturer, Christopher J. Woolverton Professor
Publisher: McGraw-Hill Education
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Chapter 11.11, Problem 1MI
When electrons from P700 are used to reduce NADP+, what compound supplies electrons for the re-reduction of P700?
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Write the net equation for electron transfer from NADH to O2.
Why are electrons carried by FADH 2 not as energy rich as those carried by NADH? What is the consequence of this difference?
The coenzyme NADP is the terminal electron acceptor in chloroplasts, according to the reaction
2 H₂O + 2 NADP+
2 NADPH + 2 H+ + O₂
Calculate the equilibrium constant, K'eq, for this reaction at 25 °C.
+
Use an E'° of -0.324 V for NADP and 0.816 V for H₂O.
K'eq
=
x10
Chapter 11 Solutions
Prescott's Microbiology
Ch. 11.1 - Retrieve, Infer, Apply Discuss the ways in which...Ch. 11.1 - Describe the nutritional requirements of the major...Ch. 11.1 - Retrieve, Infer, Apply Compare...Ch. 11.1 - Retrieve, Infer, Apply What are the three major...Ch. 11.2 - Is NAD+ reduced to NADH in the catabolic or...Ch. 11.2 - Prob. 1RIACh. 11.2 - Why is it to a cells advantage to catabolize...Ch. 11.2 - Prob. 3RIACh. 11.4 - Which reactions are examples of substrate-level...Ch. 11.4 - For what kinds of reactions is NADPH used?
Ch. 11.4 - For what macromolecule is ribose 5-phosphate a...Ch. 11.4 - Summarize the major features of the...Ch. 11.4 - Prob. 2RIACh. 11.5 - Identify the substrate and products of the TCA...Ch. 11.5 - What chemical intermediate links pyruvate to the...Ch. 11.5 - Prob. 3RIACh. 11.5 - Retrieve, Infer, Apply In what eukaryotic...Ch. 11.5 - Why is it desirable for a microbe with the...Ch. 11.6 - Prob. 1MICh. 11.6 - Prob. 2MICh. 11.6 - Prob. 1RIACh. 11.6 - Describe the current model of oxidative...Ch. 11.6 - Prob. 3RIACh. 11.6 - Prob. 4RIACh. 11.7 - Prob. 1RIACh. 11.7 - Prob. 2RIACh. 11.7 - Prob. 3RIACh. 11.8 - Prob. 1MICh. 11.8 - Prob. 1RIACh. 11.8 - Prob. 2RIACh. 11.8 - Briefly describe alcoholic, lactic acid, mixed...Ch. 11.8 - Prob. 4RIACh. 11.8 - Prob. 5RIACh. 11.9 - What is the difference between a hydrolase and...Ch. 11.9 - Prob. 2MICh. 11.9 - Retrieve, Infer, Apply Briefly discuss the ways in...Ch. 11.9 - Prob. 2RIACh. 11.9 - Retrieve, Infer, Apply Describe how a...Ch. 11.10 - How do chemolithotrophs obtain their ATP and...Ch. 11.10 - Prob. 2RIACh. 11.10 - Why can hydrogen-oxidizing bacteria and archaea...Ch. 11.10 - What is reverse electron flow and why do many...Ch. 11.10 - Arsenate is a compound that inhibits...Ch. 11.11 - When electrons from P700 are used to reduce NADP+,...Ch. 11.11 - Define the following terms: light reactions, dark...Ch. 11.11 - Prob. 2RIACh. 11.11 - What is the function of accessory pigments?Ch. 11.11 - Prob. 4RIACh. 11.11 - Compare and contrast anoxygenic phototrophy and...Ch. 11.11 - Prob. 6RIACh. 11 - Without looking in chapters 21 and 22, predict...Ch. 11 - From an evolutionary perspective, discuss why most...Ch. 11 - How would you isolate a thermophilic...Ch. 11 - Certain chemicals block ATP synthesis by allowing...Ch. 11 - Prob. 5CHICh. 11 - A cyanobacterium having photosystem I but not...Ch. 11 - Review the description of the Berkeley Pit Lake in...Ch. 11 - The archaeon Metallosphaera sedula is of great...Ch. 11 - Nitrite-oxidizing bacteria have been thought to be...
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- Given the roles of NAD*/NADH in dehydrogenation reactions and NADPH/NADP+ in reductions, as discussed on page 488, would you expect the intracellular ratio of NAD* to NADH to be high or low? What about the ratio of NADP* to NADPH? Explain your answers.arrow_forwardIt is estimated that each electron pair donated by NADH leads to the synthesis of approximately three ATP molecules, whereas each electron pair donated by FADH2 leads to the synthesis of approximately two ATP molecules. What is the underlying reason for the difference in yield for electrons donated by FADH2 versus NADH?arrow_forwardWhat ratoe of NADPH to NADP+ is required to maintain [GSH]=10mM and [GSSH]= 1 mM?arrow_forward
- The electrons that reduce nitrate to nitrite are brought to it by a short electron transport chain involving FADH2 and NADH (see Figure). In which other reactions have you seen these two electron carriers?arrow_forwardPlease Aspaarrow_forwardThe Overall Free Energy Change for Photosynthetic NADP+ Reduction What is the overall free energy change (G) for noncyclic photosynthetic electron transport? 4 (700-nm photons) + 4 (680-nm photons) + 2 H2O + 2 NADP+O2 + 2 NADPH + 2H+arrow_forward
- 38,39,40arrow_forwardImagine a leaf in bright light but an atmosphere with no carbon dioxide. Would RuBP carboxylase be functioning? Would the NADP be in the reduced or oxidized form?arrow_forwardTwo of the following are oxidizing agents and two are reducing agents. Which are which: NAD+, NADP+, NADH, and NADPH?arrow_forward
- In cyclic photophosphorylation, it is estimated that two electrons must be passed through the cycle to pump enough protons to generate one ATP. Assuming that the AG for hydrolysis of ATP under conditions existing in the chloroplast is about –50 kJ/mol, what is the corresponding percent ef- ficiency of cyclic photophosphorylation, using light of 700 nm?arrow_forwardWhat is the oxidative phosphorylation coefficient? indicate the oxidative phosphorylation coefficient of the primary electron donors in krebs cyclearrow_forwardThe net equation for oxidative phosphorylation can be written as 2NADH + 2 H+ + O2 →2 H2O + 2 NAD+. Write an analogous equation for the light reactions of photosynthesis.arrow_forward
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