In the Krebs Cycle (Citric Acid Cycle), A 4-carbon compound with a 2-carbon unit to yield a 6-carbon tricarboxylic acid Oxaloacetate, acetyl, citrate O Oxaloacetate, citrate, isocitrate O Fumarate, malate, oxaloacetate O Acetyl, succinate, malate condenses
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- 1 2 points Order the following TCA cycle metabolites in the order they are produced in one turn of the citric acid cycle. Not all answers will be used. 2 1 4 3 TI Isocitrate Citrate Lactate Pyruvate Oxaloacetate Isocitrate Succinyl-CoA Aconitate 3-Phosphoglycerate -DOfull oxidation of 2 moles of glucose produce 36ATP O 72ATP 48ATP O 106ATP OThere are eight chemical reactions that occur in the citric acid cycle process. The reactions of the citric acid cycle are shown in the figure below. acetyl-coenzyme A 0 CH₂-C-CoA HO-CH Reaction 7 O malate CH₂ CH || CH fumarate FADH₂ Reaction 6 FAD H+ + NADH NAD+ 1,0 H₂C CH₂ CH₂ Reaction 8 succinate ADP 0=C GTP CH₂ oxaloacetate Reaction 5 H-COA GDP ATP H₂O Reaction 1 C Reactions of the Citric Acid Cycle CH₂ CH₂ H-COA 0=C 1 CoA succinyl-CoA H+ HO-C Reaction CO₂ с CH₂ NADH CH₂ citrate Reaction 2 H-COA Reaction 3 CO₂ I CH₂ T CH₂ 0=C NAD+ HO–CH a-ketoglutarate CH, CH isocitrate NAD+ H+ + NADH In chapters 9 and 10, you were introduced to several classes of organic reactions. These classes include esterification, decarboxylation, hydration reactions, dehydration of alcohols, oxidation of alcohols, oxidation of aldehydes, reduction of aldehydes, and reduction of ketones. Find at least one of these reaction classes in the citric acid cycle. List the reaction number and the reaction. Write a…
- Which of the following events does not occur during Krebs Cycle? Citrate synthase catalyzers the transfer of an acetyl group from acetyl coenzyme A to oxaloacetate to form citrate. Isocitrate dehydrogenase converts citrate to its isomer isocitrate. A carbon dioxide is released when alpha-ketoglutarate is oxidized to succinyl coenzyme A. The energy released from the conversion of succinyl coenzyme A to succinate is used to transfer a phosphate group to ADP to form ATP. During Krebs Cycle, succinate is oxidized to fumarate which is coupled to the reduction of FAD to FADH2. During electron transport, the electrons from FADH2 are transferred to coenzyme Q. Which of the following catalyzes these reactions? NADH dehydrogenase Succinate dehydrogenase FADH2 hydrogenase NADH hydrogenase reductaseWhich one of the following pairs of compounds are joined together to conserve carbon in the glyoxylate cycle? Acetyl-CoA + Glyoxylate Oxaloacetate + Malate CO2 + CO2 Pyruvate + CO2 Ribulose-1,5-Bisphosphate + CO2 O O O O CThe image below shows the citric acid cycle. Reactions (3) and (4) are referred to as "oxidative". What does this mean? Select the correct statement Dehydrogenation HO–CH Malate Hydration H₂O malate coo- dehydro- genase CH₂ 1/ COO 0-c-coo ÇOO™ Fumarate CH HC fumarase CH₂-COO™ Oxaloacetate FADH₂ Succinate succinate dehydrogenase Dehydrogenation CH₂-COO- CH ₂ COO™ CoA-SH Acetyl-CoA GTP (ATP) CH3-C-S-COA H₂O (5) Substrate-level phosphorylation succinyl-CoA synthetase citrate synthase Citric acid cycle Figure 16-7 Lehringer Brinciples of Biochemistry Fifth Edition Condensation NADH CH₂-COO™ CH₂ GDP C-S-COA (ADP) O + P₁ CoA-SH CH₂-COO™ HỌ—C—C00 2a CH₂-COO Dehydration Citrate H₂O CO2 aconitase a-ketoglutarate dehydrogenase CoA-SH CH₂-COO™ C-COO- -COO aconitase HO-C-H isocitrate dehydrogenase/ Coo- complex CH₂-COO CH₂ C=O COO™ H₂O Ho CH₂-COO™ Oxidative Succinyl-CoA decarboxylation H-C-COO cis-Aconitate CO₂ (2b) Hydration Isocitrate Oxidative decarboxylation a-ketoglutarate
- Yeasts and plants can use acetyl-CoA as a carbon source by omitting which two steps in the TCA cycle? O Citrate isocitrate; isocitrate → a-ketoglutarate O Isocitrate → a-ketoglutarate; a -ketoglutarate → succinyl-CoA - O Oxaloacetate citrate; malate → oxaloacetate O Succinyl-CoA succinate; succinate → fumarateA figure of the energy payoff phase of glycolysis is shown below. Look at the reaction labelled with a 6 (on the far left), which involves the conversion of glyceraldehyde-3-phosphate to 1,3-bisphosphoglycerate. reduced? HC O CHOH CH₂O-P Glycer- aldehyde 3-phosphate (G3P) 2 NADH 2 NAD+ + 2 H+ Triose phosphate 2 P₁ dehydrogenase Copyright © 2018 Pearson Canada Inc. P CHOH CH₂0-P 1,3-Bisphospho- glycerate 1,3- bisphosphoglycerate NADH NAD+ 2 ADP GLYCOLYSIS: Energy Payoff Phase Glyceraldehyde-3-phosphate 2 ATP Phospho- glycerokinase 2 Which of the compounds is C=O CHOH H–CO- P Phospho- CH₂0-P glyceromutase CH₂OH 8 3-Phospho- glycerate C=O 2-Phospho- glycerate 2. ATP 2 ADP BYD Pyruvate kinase 10 2 H₂O Enolase 2 C=O CO-P CH2 Phosphoenol- pyruvate (PEP) CH3 PyruvateWhich of the following is NOT produced during the oxidative phase of the pentose phosphate shunt? a Ribulose-5-Phosphate b Glyceraldehyde-3-phosphate c CO2 d NADPH
- Consider MYRISTIC ACID CH3-(CH2)12 - COOH C. How many cycles of B- oxidation are needed for complete oxidation?The coenzyme NAD+ is required for which glycolytic reaction shown below? Oglyceraldehyde-3-P→ 1,3-bisphosphoglycerate glucose glucose-6-P fructose-6-P→ fructose-1,6-BP 2-phosphoglycerate → phosphoenolpyruvatecoo- 21 CH2 316 НО-С-СОО- HOC COO- 4 CH2 | 5, °coo-