1. What are the three major pathways that eventually become entry points of moleculesinto the Krebs Cycle? Which molecules from these respective pathways are integratedinto the Krebs Cycle?2. How is a "committed step" defined in the context of a metabolic pathway and why arethey important? Which steps and/or enzymes are involved in the committed steps inthe Krebs Cycle? What are the possible implications of these steps were deregulated?3. What are the three Krebs Cycle inborn errors mentioned in the paper? Why are theycalled deficiencies? What do you think are the probable causes for these?

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Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter7: Cellular Respiration: Harvesting Chemical Energy

Section: Chapter Questions

Problem 7TYK

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Why does the Krebs cycle operate only under aerobic conditionseven though it does not use molecular oxygen in any of its reactions?
Both prokaryotic and eukaryotic organisms carry out some form of glycolysis. How does ha fact support or not support the assertion that glycolysis is one of the oldest metabolic pathways?
What are the three major pathways that eventually become entry points of molecules into the Krebs Cycle? Which molecules from these respective pathways are integrated into the Krebs Cycle? What are the three Krebs Cycle inborn errors mentioned in the paper? Why are they called deficiencies? What do you think are the probable causes for these?
Which of the following do cellular respiration and fermentation have in common? There might be more than one answer. A) Both of these pathways provide a mechanism for oxidation of glucose B) The citric acid cycle is involved in both of these pathways C) Enzymes are involved in both of these pathways D)ATP synthase is required to complete both of these pathways E)Both of these pathways occur within mitochondria F) ATP is generated in both of these pathways .
1 what is the common intermediary in the catabolism of carbohydrates, proteins and lipids? 2 What cyclic pathway doe sthis common metabolite enter? 3 what are the roles of NAD+ and FAD in metabolism 4 what are the reduced forms of NAD+ and FAD? 5 what are the entry point for the reduced forms of NAD+ and FAD in the electron transport chain?
1- in comparing aerobic and anaerobic respiration , something that is always different between the two processes is (a)the type of terminal electron acceptor used (b) the type of sugar that is used to start the process (c) whether chromosoms is used or not (d) the location where they occure in the cell (e) the type of glycolysis used 2- Which of the following is not a mechanism that bacteria use to exhibit resistence to antibiotices . (a) expressing membrane efflux pumps that remove the antibiotic from the bacterial cell (b)secreting protiens that can bind to antibiotics and disable them before they enter the cell (c)creating exclusion barrierrs that prevent the antibiotic from the entering the cell (d)changing bacterial targets (e)producing enzymes that destroy the antibiotic please give answer for both questions asap please
Because of an inborn error of metabolism, suppose that the enzyme that catalyzed the third reaction in your pathway (see no. 5a) was defective. Describe the effects this wouldhave on the concentrations of the intermediates in your pathway.
1. Label each statement about citric acid cycle as true or false and state why you say so. a. The citric acid cycle is a cyclic metabolic pathway that involves eight steps. b. Four molecules of NADH and one molecule of FADH2 are formed in the cycle. c. The cycle is activated when the amount of available ATP is low and energy demands are high. d. The cycle is inhibited when the concentration of NADH is low.
Draw the pathway for the conversion of Propionyl CoA to Succinyl CoA as it occurs in thematrix of the mitochondria. Show the structures and names of all reactants and products, as well asthe names of the enzymes. You do not need to draw the structures of ATP, NAD+, CoA, etc., but doshow them as reactants or products in the appropriate places. You do not need to show themechanisms of the enzymes. Draw the pathway for the conversion of Succinyl CoA into 4 CO2. Show the structures andnames of all reactants and products, as well as the names of the enzymes. You do not need to drawthe structures of ATP, NAD+, CoA, etc., but do show them as reactants or products in the appropriateplaces. You do not need to show the mechanisms of the enzymes. How many ATPs would be generated by the complete oxidation of Propionyl CoA into 3 CO2using any of the required enzymes of -oxidation, gluconeogenesis, glycolysis,the citric acid cycle andoxidative phosphorylation?
1. What is the function of molecules like NAD+/NADH and FAD/FADH2 in cells? 2. Why is the Krebs cycle important in both catabolism and anabolism?
What are the 3 major pathways that eventually become entry points of molecules into the Krebs Cycle? What are the molecules from these respective pathways are integrated into the Krebs Cycle?
Phosphofructokinase is an important control enzyme in the regulation of cellular respiration. Which of the following statements correctly describes phosphofructokinase activity? a. It is inhibited by citrate, an intermediate of the citric acid cycle. b. It catalyzes a reaction which increases the rate of the overall pathway. c. It catalyzes an early step of glycolysis which has the lowest level of activation energy among the overall pathway. d. It is activated by ATP. e. It is inhibited by AMP.

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