PRESCOTT'S MICROBIOLOGY
11th Edition
ISBN: 2818440045677
Author: WILLEY
Publisher: MCG
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Chapter 20.1, Problem 2CC
Why do methanogens use the reductive acetyl-CoA pathway for carbon fixation?
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Chapter 20 Solutions
PRESCOTT'S MICROBIOLOGY
Ch. 20.1 - MICRO INQUIRY Given that the DC/HB pathway uses...Ch. 20.1 - Prob. 2MICh. 20.1 - Prob. 1CCCh. 20.1 - Why do methanogens use the reductive acetyl-CoA...Ch. 20.1 - Prob. 3CCCh. 20.1 - Compare the ATP and NADH yield of each of the...Ch. 20.2 - MICRO INQUIRY Identify the potential electron...Ch. 20.2 - Retrieve, Infer, Apply What are thermoacidophiles...Ch. 20.2 - Prob. 2CCCh. 20.2 - Compare the carbon and sulfur metabolism of...
Ch. 20.2 - Prob. 4CCCh. 20.2 - Prob. 5CCCh. 20.3 - MICRO INQUIRY What are the mechanisms by which...Ch. 20.3 - Retrieve, Infer, Apply Why are the growth yields...Ch. 20.3 - Prob. 2CCCh. 20.3 - What is the ecological and practical importance of...Ch. 20.3 - Where are extreme halophiles found, and what is...Ch. 20.3 - What is the difference between sensory rhodopsin...Ch. 20.3 - How is Thermoplasma able to live in acidic, very...Ch. 20.3 - In what way are members of the genus Archaeoglobus...Ch. 20 - Prob. 1RCCh. 20 - Prob. 2RCCh. 20 - Prob. 3RCCh. 20 - Prob. 4RCCh. 20 - Prob. 5RCCh. 20 - Prob. 6RCCh. 20 - Prob. 7RCCh. 20 - Some believe that archaea should not be separate...Ch. 20 - Prob. 2ALCh. 20 - Prob. 3ALCh. 20 - Prob. 4ALCh. 20 - Prob. 5ALCh. 20 - Prob. 6ALCh. 20 - Prob. 7AL
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- Referring to figure 5 and 8 which substrate molecule serves as the phosphate donor during substrate-level phosphorylation in step 10 of glycosis and the succinyl CoA-succinate step of the Krebs Cycle?arrow_forwardWhat is the substrate that is not produced during the non-oxidative phase of the pentose phosphate pathway? Why?arrow_forwardOutline the steps involved in the production of malonylCoA from acetyl-CoA.arrow_forward
- How many protons are shuttled from the matrix to the intermembrane space by the products of the Kreb's Cycle as one molecule of acetyl-CoA and oxaloacetate are converted to one molecule of fumarate?arrow_forwardWhy is acetyl CoA an especially appropriate activator for pyruvate carboxylase?arrow_forwardHow many acetyl CoA molecules are produced in one cycle of beta oxidation? How many cycles would it take to catabolize a stearic acid molecule (a fatty acid, [18:0]) into acetyl Co A units? a)How many acetyl CoA molecules would be produced? b) How many reduced nucleotides would be produced? c) If a molecule of glucose produces a net 32 ATP when completely catabolized, which do you think will produce more energy, one molecule of glucose or one molecule of stearic acid? Justify your answer.arrow_forward
- If acetyl-CoA is labeled with 14C at its methyl group, how many rounds of the cycle are required before 14CO2 is released?arrow_forwardDoes PFK-2 (Phosphofructokinase-2) have coenzymes and Allosteric reguation?arrow_forwardThe immediate precursor to acetyl–CoA from glycolysis is pyruvate.a) Write the pathway (not the mechanism) for the series of steps for this conversion. Includestructures for all coenzymes and reactants for each step.b) Discuss the mechanistic advantages offered by this multienzyme complex. Be specific and giveexamples.c) The last step of the reaction, catalyzed by enzyme 3, includes three coenzymes and oxidation.Write the mechanism for this enzyme.arrow_forward
- The products of pyrimidine base catabolism, β-alanine and β-aminoisobutyrate, can be further degraded to acetyl-CoA and succinyl-CoA, respectively. Can you suggest the types of reaction required to accomplish these transformations?arrow_forwardWhy is acetyl-CoA considered a “strategic intermediate” in respiration?arrow_forwardConsider an acetyl CoA that enters the TCA cycle. Let’s call this cycle “Cycle 1.” Let’s say you put a radiolabel on the carbonyl carbon of acetyl CoA that will allow us to track this carbon through the TCA cycle. Now, trace its path through the TCA cycle and answer the following questions: (a) Does the carbonyl carbon of Acetyl CoA come out as CO2 in Cycle 1? (b) If your answer to (a) was No, in which cycle does it come out as CO2 (Cycle 2, 3, 4 …)arrow_forward
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