1. The first step in the payoff phase of glycolysis is catalyzed by the enzyme glyceraldehyde 3-phosphatedehydrogenase, an enzyme that contains a nucleophilic cysteine playing a central role in the reaction.A) In the direction of gluconeogenesis, what reaction does this enzyme catalyze? AG° = -6.3 kcal/mol for thisreaction in the direction of gluconeogenesis. Based on what you know about the substrates involved,provide two chemical reasons as to why the AGO of this reaction is negative.

Gluconeogenesis is the metabolic pathway by which glucose is synthesised from the sources like…

Answered: 1. The first step in the payoff phase…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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All the dehydrogenases of glycolysis and the citric acid cycle use NAD+ (E°' for NAD+/NADH is -0.32 V) as the electron acceptor, except succinate dehydrogenase, which uses covalently bound FAD (E°' for FAD/FADH2 is +0.050 V). Suggest why FAD is a more appropriate electron acceptor than NAD+ in the dehydrogenation of succinate, based on the E°' values of fumarate/succinate (E°' = +0.031 V)
During glycogen synthesis, glucose-1P is converted into a molecule called UDPG. This reaction also cleaves uridine triphosphate (UTP) forming uridine monophosphate and pyrophosphate (PPi). Provide four reasons why UTP can be used to power this reaction (no diagrams necessary).
Organisms growing anaerobically cannot perform glycolysis for long without reducing the pyruvate from glycolysis into another compound, most commonly to lactate or to ethanol plus CO2. Both of these reactions are given below in their unbalanced forms. Explain in one sentence why one of these reducing steps is needed to sustain anaerobic glycolysis.
A 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 Pyruvate
The phosphorylation and oxidative decarboxylation of oxaloacetate by inorganic phosphate (Pi) to make phosphoenolpyruvate and carbon dioxide is endergonic under intracellular conditions. It is characterized by this equation: Oxaloacetate + Pi ←→ Phosphoenolpyruvate + H2O + CO2 ΔG’ = +24.6 kJ/mol The synthesis of GTP from GDP and inorganic phosphate (Pi) in solution is endergonic under intracellular conditions, and it is characterized by this equation: GDP + Pi ←→ GTP + H2O ΔG’ = +30.5 kJ/mol Write a new net thermodynamically coupled reaction equation that describes the synthesis of phosphoenolpyruvate from oxaloacetate using the hydrolysis of GTP to power the reaction and calculate the new net ΔG’ of this reaction. Show all of your work.
Draw the catalytic mechanism of the reaction catalyzed by glyceraldehyde 3-phosphate dehydrogenase(GAPDH). In this reaction, which amino acid acts as a nucleophile? Which compound is oxidized andwhich is reduced? Which product is referred to as a “high-energy compound” and why?
Which one of the following regarding the chemistry of glycolysis & gluconeogenesis is FALSE? Reaction 6 of glycolysis catalyzed by glyceraldehyde-3-phosphate dehydrogenase involves oxidation & addition of a P; group. Reaction 3 of gluconeogenesis catalyzed by enolase involves hydration, the addition of water to a carbon-carbon double bond (C=C) to form an alcohol. Reaction 1 of gluconeogenesis catalyzed by pyruvate carboxylase involves decarboxylation. Reaction 9 of gluconeogenesis catalyzed by fructose-1,6-bisphosphatase involves dephosphorylation (phosphoester hydrolysis). Reaction 1 of glycolysis catalyzed by hexokinase involves phosphorylation (using ATP). O 0000
Describe how a) Mean Arterial Pressure, b) Maximal Oxygen Consumption, and c) Blood Flow are determined using its formula. In addition, you should explain what those factors are including cardiac output, stroke volume, heart rate, resistance, a-vO2 difference, etc. Describe how many ATPs can be generated by complete cycles of beta oxidation of free fatty acid with 20 carbons. You should indicate how many cycles of beta oxidation and Krebs cycle, and total number of products as well
Mention two biological advantages to an organism that stores its carbohydrate reserves as starch or glycogen rather than as an equivalent amount of free glucose. What role does the protein, glycogenin play in glycogen synthesis? Name the reactants and products of the first two steps of the gluconeogenesis pathway if pyruvate is used as the starting material (structures not needed). Explain why people with a deficiency of the enzyme glucose 6-phosphate dehydrogenase (G6PDH) suffer from hemolytic anemia What is meant by reciprocal regulation? Name one compound that reciprocally regulates glycolysis and gluconeogenesis pathways. Which enzymes are regulated by this compound? What reactions are catalyzed by these enzymes?
Indicate what will happen (increase, decrease or no effect) to the activity of the enzyme or rate of the metabolic pathway given the following conditions.
Order the cofactors based on their use in the mechanism of the a-etogluterate dehydrogenase complex. 1. Stabilizes a carbanion due to decarboxylation 2. Allows for the splitting of the carbon skeleton from the electron pair generated in a redox reaction 3. Enzyme bond electron carrier that is part of dihydrolipoyl dehydrogenase 4. Final electron acceptor in the overall reaction catalyzed by this complex 1 2 3 4 answer choices: lipoamide, biotin, 2 Fe - 2S cluster, TPP, NAD+, FAD
The following nutrient molecule is digested and transported to a cell where it undergoes further catabolism: но c-(CH;)14-CH3 di In the table below, list the important products of the complete B oxidation of this molecule. • In the first column of the table, write the chemical formula, name, or standard biochemical symbol for a product molecule. In the second column, write the total number of these molecules produced. • Only list the Important products, including (1) molecules with any of the carbon atoms that were in the original molecule, (2) energy storage molecules (like ATP), and (3) newly oxidized or reduced coenzymes. List each product molecule on a separate row. You can add more rows if you need them. • Be sure you write the number of product molecules formed by the complete B oxidation of the molecule above. • Do not include the products of any catabolic activity that happens before or after B oxidation, including any necessary activation. If the molecule contains small parts…

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