EBK CAMPBELL BIOLOGY
10th Edition
ISBN: 9780136539414
Author: Reece
Publisher: VST
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Textbook Question
Chapter 9, Problem 5TYU
What is the oxidizing agent in the following reaction?
Pyruvate + NADH + H+ à Lactate + NAD+
(A) oxygen
(B) NADH
(C) lactate
(D) pyruvate
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List the following substances in order of their increasing oxidizing power: (a) acetoacetate, (b) cytochrome b (Fe3+, (c) NAD+, (d) SO42− , and (e) pyruvate.
By the reaction catalyzed by the pyruvate dehydrogenase complex:
a) NAD+ is oxidized to become NADH that is used later in the ETC to generate
ATPs
Ob) NAD+ is reduced to become NADH that is used later in the ETC to generate
ATPs
c) FAD is oxidized to become FADH2 that is used later in the ETC to generate
ATPs
O
d) FAD is reduced to become FADH2 that is used later in the ETC to generate
ATPs
e) A and C
f) B and D
(d)
||
CH3-C-
=2
CH3-C
O=
+ CO₂
2
Pyruvate
Acetate
The conversion of pyruvate to acetate represents
Consequently, the complete balanced reaction is
a reduction.
no change in oxidation state.
an oxidation.
Chapter 9 Solutions
EBK CAMPBELL BIOLOGY
Ch. 9.1 - Prob. 1CCCh. 9.1 - WHAT IF? If the following redox reaction...Ch. 9.2 - VISUAL SKILLS During the redox reaction in...Ch. 9.3 - Prob. 1CCCh. 9.3 - What process in your cells produce the CO2 that...Ch. 9.3 - VISUAL SKILLS The conversions shown in Figure...Ch. 9.4 - WHAT IF? What effect would an absence of O2 have...Ch. 9.4 - WHAT IF? In the absence of O2 as in question 1,...Ch. 9.4 - MAKE CONNECTIONS Membranes must be fluid to...Ch. 9.5 - Consider the NADH formed during glycolysis. What...
Ch. 9.5 - WHAT IF? A glucose-fed yeast cell is moved from...Ch. 9.6 - MAKE CONNECTIONS Compare the structure of a fat...Ch. 9.6 - Prob. 2CCCh. 9.6 - Prob. 3CCCh. 9.6 - VISUAL SKILLS During intense exercise, can a...Ch. 9 - Describe the difference between the two processes...Ch. 9 - Which reactions in glycolysis are the source of...Ch. 9 - What molecular products indicate the complete...Ch. 9 - Briefly explain the mechanism by which ATP...Ch. 9 - Prob. 9.5CRCh. 9 - Prob. 9.6CRCh. 9 - Level 1: Knowledge/Comprehension 1. The immediate...Ch. 9 - Prob. 2TYUCh. 9 - 3. The final electron acceptor of the electron...Ch. 9 - Prob. 4TYUCh. 9 - What is the oxidizing agent in the following...Ch. 9 - When electrons flow along the electron transport...Ch. 9 - Prob. 7TYUCh. 9 - Prob. 8TYUCh. 9 - MAKE CONNECTIONS The proton pump shown in Figures...Ch. 9 - INTERPRET THE DATA Phosphofructokinase is an...Ch. 9 - DRAW IT The graph here shows the pH difference...Ch. 9 - EVOLUTION CONNECTION AIP synthases are found in...Ch. 9 - SCIENTIFIC INQUIRY In the 1930s, some physicians...Ch. 9 - WRITE ABOUT A THEME: ORGANIZATION In a short essay...Ch. 9 - SYNTHESIZE YOUR KNOWLEDGE Coenzyme Q (CoQ) is sold...
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- The values of the reduction potential (Eº') of the conjugated redox pairs NAD+/NADH and pyruvate / lactate are -0'32 V and -0'19 V respectively. a) Which of the two conjugated pairs has a greater tendency to lose electrons? Reason for it. b) What is the strongest oxidizing agent? Reason for it. c) If we start with 1M concentrations of each reagent and product at pH 7.0 in which sense the reaction will pass pyruvate + NADH + H+ ⇄ lactate + NAD+ d) What is the standard free energy variation (ΔGº’ at 25ºC) for the conversion of pyruvate to lactate? e) What is the equilibrium constant of this reaction?arrow_forwardWhat is this question?arrow_forwardIn the energy recovery phase of glycolysis, Glyceraldehyde 3-p reacts with NAD+ In this reaction, which will be oxidized, and which will be reduced. In simple terms, what does it mean when a chemical is oxidized, and what does it mean when a chemical is reduced?arrow_forward
- 1 a) What is meant by the ATP currency exchange ratio? Why does the oxidation of mitochondrial FADH2 generate one less ATP than oxidation of mitochondrial NADH? b) If 12 H+ are moved across the inner mitochondrial membrane by NADH oxidation, and each ATP synthesized requires 3 H+ to move through ATP synthase, why are only 3 ATP molecules produced by oxidation of each NADH?arrow_forwardIdentify the oxidizing and reducing agents in the followingreaction:arrow_forwarda) Using full chemical structures of substrates and products, draw the two possible pyruvate reduction pathways that regenerate NAD+ from NADH in the absence of oxygen gas. Give names of all compounds and enzymes involved. b) Draw the step in glycolysis that requires at least one of the above pathways to be functional in the absence of oxygen. Give names of all compounds and enzymes involved.arrow_forward
- Ethanol is oxidized in the liver to form acetate, which is then converted to acetyl-CoA. Determine how many molecules of ATP are produced from 1 mol of ethanol. (Note that 2 mol of NADH are produced when ethanol is oxidized to form acetate.)arrow_forwardUnder standard conditions, will the following reactions proceed spontaneously as written? (1) Fumarate + NADH + H+ (2) succinate + NAD+ Cyto a (Fe²+) + cyto b (Fe³+) = cyto a (Fe³+) + cyto 6 (Fe²+) barrow_forwardGiven the overall equation for respiration (C6H12O6 + 6O2 6CO2 + 6H2O), in which step(s) in the respiratory pathway is/are each of the reactants used up and each of the products made? Photosynthetic reactions require NADPH while NADH is involved in aerobic respiration. These two molecules regulate both the biosynthetic and the catabolic activity of the cell. Explain how they do this. Note that NAD+ kinase phosphorylates NAD+ to produce NADPH+.arrow_forward
- Which of the following statements about the pentose phosphate pathway (PPP) is true? (A) The purpose of the pentose phosphate pathway is to produce NADH for use in anabolic pathways and ribose 6-phosphate for nucleotide synthesis.(B) The oxidative arm of the PPP produces (2) NADPH per glucose 6-phosphate that enters the pathway. (C) Phosphopentose isomerase converts the ribose 5-phosphate made in the oxidative arm of the PPP into ribulose 5-phosphate that is used to form the ribose sugar of nucleotides.(D) The non-oxidative arm of the PPP interconverts between ribose 5-phosphate and a variety of intermediates of b-oxidation. (E) One of the functions of the PPP is to provide NADPH that inhibits glutathione reductase so that it cannot oxidatively damage RBCs.arrow_forwardCompound X is an inhibitor in respiratory electron transfer. It binds to the Fe3+ of Complex IV preventing oxygen binding. (a) Suggest an example of compound X. (b) How would compound X affect the NADH / NAD+ ratio? Explain briefly. (d) Given: Complexes II, III and IV, cytochrome c, Q, succinate and compound X Draft the ELECTRON FLOW and determine the FINAL ELECTRON ACCEPTOR with explanation under AEROBIC condition.arrow_forwardThe conversion of glyceraldehyde-3-phosphate into 1,3-bisphosphoglycerate reduces NAD+ to NADH. Under anaerobic conditions, how is NADH oxidized back to allow for continuing glycolysis? (name the compounds involved in the reaction besides NADH and their draw structures)arrow_forward
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