Follow the two carbon atoms that enter the citric acid cycle (C₂). Are the two CO₂ molecules given off inone turn of the citric acid cycle composed of the same 2 carbon atoms that entered the cycle?NADH + H+NAD+HHỌ—C—COO-H₂C-COO-°↑7FADH₂0 C-C00H₂C-COO-OxaloacetateMalateHC-COO--OOC-CH FumarateFADSuccinateH₂C-COOH₂C-COOCH,CO—S-CoAAcetyl coenzyme AGTPCOAGDPCOAH₂C-COO-HỌ–C–COO-H₂C-COO-CitrateH₂C-COO-Isocitrate HC-COO-HO–C–COOHeTCO₂Succinyl COAH₂C-COO-CO₂a-KetoglutarateCoAH₂C-CO-S-CoAH₂C-COOH₂C0-C-COO-NAD+NADH + H+NAD+NADH + H+

The citric acid cycle (also known as the Krebs cycle or tricarboxylic acid cycle) is a series of…

Answered: Follow the two carbon atoms that enter…

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter2: Cell Physiology

Section: Chapter Questions

Problem 10RE: Using the answer code on the right, indicate which form of energy production is being described: 1....

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The reaction pictured is an oxidation-reduction reaction in the citric acid cycle in which the energy-carrier molecule NADH is generated. Identify which molecule in the reaction will be oxidized and which molecule will be reduced. Place a single answer choice in each box. COO- HO-C-H H-C-H COO- Malate NAD+ NADH + H+ Oxidized malate oxaloacetate COO- H-C-H ī COO- Oxaloacetate Reduced NADH NAD+
Complete the sentence describing the pentose phosphate pathway in cells that require much more ribose 5-phosphate than NADPH. These cells need ribose 5-phosphate but have relatively higher concentrations of NADPH and lower concentrations of NADP*. Choose from the listed words to fill in the blanks: xylulose 5-phosphate, fructose 6-phosphate, glucose 6-phosphate, five, two, three, glyceraldehyde 3- phosphate, erythrose 4-phosphate, sedoheptulose 7-phosphate. One molecule of and two molecules of are used to generate molecules of ribose 5-phosphate by the reverse reactions of the nonoxidative phase of the pentose phosphate pathway.
There 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…
Step 6 of the citric acid cycle is shown. Which statement best describes the role of FAD in this reaction? CH₂ lal CH₂ FAD FADH₂ CO₂ CO₂ succinate CH CH fumarate OA) FAD causes the oxidation of succinate to form fumarate. B) FAD causes succinate to undergo hydration to form fumarate. C) FAD causes the isomerication of succinate to form fumarate. D) FAD causes the reduction of succinate to form fumarate.
Which of the following is the second step of Citric Acid Cycle? Select one: a. Isocitrate and then decarboxylated and oxidized to produce alpha-ketoglutarate, Carbon dioxide and NADH b. Succinyl-CoA becomes Succinate and forms one ATP molecule and Coenzyme A-SH c. alpha-ketoglutarate is oxidized and decarboxylated to produce Succinyl-CoA, Carbon dioxide and NADH d. Malate is oxidized to become oxaloacetate forming NADH e. Fumarate is combined with water to become Malate f. Citrate is rearranged to become Isocitrate g. Pyruvate is decarboxylated to become acetyl-CoA producing NADH and Carbon dioxide h. Oxaloacetate combines with the acetyl from acetyl-CoA to produce Citric acid(citrate) i. Succinate is oxidized to become fumarate forming FADH2
Which of the following is the sixth step of Citric Acid Cycle? Select one: a. Succinate is oxidized to become fumarate forming FADH2 b. alpha-ketoglutarate is oxidized and decarboxylated to produce Succinyl-CoA, Carbon dioxide and NADH c. Isocitrate and then decarboxylated and oxidized to produce alpha-ketoglutarate, Carbon dioxide and NADH d. Oxaloacetate combines with the acetyl from acetyl-CoA to produce Citric acid(citrate) e. Malate is oxidized to become oxaloacetate forming NADH f. Fumarate is combined with water to become Malate g. Citrate is rearranged to become Isocitrate h. Pyruvate is decarboxylated to become acetyl-CoA producing NADH and Carbon dioxide i. Succinyl-CoA becomes Succinate and forms one ATP molecule and Coenzyme A-SH
How many times must the TCA cycle be performed to oxidize one molecule of glucose completely to six molecules of CO2? Why?
Since no molecular oxygen participates in the citric acid cycle, the steps in which acetyl groups are oxidized to CO2 involve removal of hydride ions and hydrogen ions. What is the acceptor of hydride ions? What is the acceptor of hydrogen ions?
Assuming that the glycerol 3-phosphate shuttle is operative, a complete oxidation of three molecules of glucose (by a eukaryotic cell) into carbon dioxide and water would produce approximately ATP molecules via oxidative phosphorylation only. (Consider NADH = 2.5 ATP and FADH2 = 1.5 ATP)
The citric acid cycle is shown. The methyl carbon in acetyl CoA is labeled with C14C14 (shown in red). Identify which of the carbons in each intermediate will be labeled in the first round of the cycle by selecting the indicated carbon(s). Each question has multiple options, answering with only one option is incorrect. Which carbon(s) in α‑ketoglutarate will contain C14? 1 2 3 4 5 Which carbon(s) in succinyl‑CoA will contain C14? 1 2 3 4 Which carbon(s) in succinate will contain C14? 1 2 3 4 Which carbon(s) in fumarate will contain C14? 1 2 3 4 Which carbon(s) in malate will contain C14? 1 2 3 4 Which carbon(s) in oxaloacetate will contain C14? 1 2 3 4
The citric acid cycle is shown. The methyl carbon in acetyl CoA is labeled with C14C14 (shown in red). Identify which of the carbons in each intermediate will be labeled in the first round of the cycle by selecting the indicated carbon(s). Each question has multiple options, please choose more than one. Which carbon(s) in α‑ketoglutarate will contain C14? 1 2 3 4 5 Which carbon(s) in succinyl‑CoA will contain C14? 1 2 3 4 Which carbon(s) in succinate will contain C14? 1 2 3 4 Which carbon(s) in fumarate will contain C14? 1 2 3 4 Which carbon(s) in malate will contain C14? 1 2 3 4 Which carbon(s) in oxaloacetate will contain C14? 1 2 3 4
All of the following occurs during the citric acid cycle EXCEPT Choose one from the following: (A) oxaloacetic acid, a 4 carbon molecule, binds to the 2 carbon acetyl group to form citric acid (B) hydrogen ions are bound to the co-enzyme FAD (C) energy is stored in the formation of GTP (D) oxygen is used (E) carbon dioxide is released

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