Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Question
Chapter 1, Problem 61SA
Summary Introduction
To review:
The comparison between anabolic and catabolic pathways, and the description of the molecules thatlink both the processes.
Introduction:
The
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What is the relationship between anabolic and catabolic pathways?
Intermediates of a pathway are shown in the following scheme. Using curved arrows, show the mechanism of each step labeled with a blue letter. Draw out abbreviated structures of the coenzymes, so that you can effectively show all arrow pushing. You may abbreviate the coenzymes by putting R groups on the molecule, but do draw out the parts of the structure that are involved in the arrow pushing.
Some of the transformations will require you to show multiple structures to show all of the arrow pushing (particularly some of the coenzyme-mediated steps). You do not need to show specific amino acid residues that perform the catalysis. You can abbreviate acidic amino acid residues “Enz–B–H” and basic residues “B–Enz”.
Are enzyme-catalyzed reactions examples of homogeneous or heterogeneous catalysis?
Chapter 1 Solutions
Biochemistry: The Molecular Basis of Life
Ch. 1 - Prob. 1RQCh. 1 - Prob. 2RQCh. 1 - Prob. 3RQCh. 1 - Prob. 4RQCh. 1 - Prob. 5RQCh. 1 - Prob. 6RQCh. 1 - Prob. 7RQCh. 1 - Prob. 8RQCh. 1 - Prob. 9RQCh. 1 - Prob. 10RQ
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Similar questions
- What are the four principal compounds participating in the common catabolic pathway? What are their functions?arrow_forwardExplain how precursor molecules serve as junctions between catabolic and anabolic pathways.arrow_forwardWhich of the following statements about isozymes is correct? (Select all that apply.) (a) Isozymes allow reactions to be optimized under different conditions. (b) The main reason for isozymes is so that a given reaction is never completely inhibited. (c) Isozymes have completely different active sites. (d) Bind the same substrates but form different products. (e) Isozymes display different physical properties, such as kinetic parameters.arrow_forward
- Consider the reaction: H O C—C—C—SCOA H₂C(CH₂)C= CO H H₂C-(CH₂) What kind of reaction is being performed here? b. What enzyme performs this reaction? OH H O O=C -C—C—C—SCOA H H c. What cofactors, if any, are required for this reaction?arrow_forwardWhy do enzymes contain metals? What general reaction types to metalloenzymes catalyze?arrow_forwardDecarboxylases can catalyze which type of reaction?arrow_forward
- Consider a reaction in which reactants X and Y combine to form the product Z. The diagram below compares the reaction coordinates for the catalyzed and uncatalyzed pathways of this reaction. B. X+Y Reaction Coordinate What does letter B represent? O Letter B represents the activation energy of the uncatalyzed reaction pathway. Letter B represents the energy difference between the reactants and products for the uncatalyzed pathway. O Letter B represents the activation energy of the catalyzed reaction pathway. Letter B represents the energy difference between the reactants and products for the catalyzed pathway. Energyarrow_forwardList three important characteristics of catabolic processarrow_forwardThe figure below represents a reaction in the presence and absence of an enzyme catalyst. What can you conclude about this reaction? energy activation energy activation energy 1 uncatalysed reaction catalysed reaction A) It is endergonic in the absence of the enzyme. B) It will proceed more quickly in the presence of the enzyme. C) Once the reaction has reached equilibrium, there will be more product in the enzyme-catalyzed reaction. D) It has a negative AG. OE) Both B and D are truearrow_forward
- create a single illustration that will interrelate or link the two opposing pathways, the Glycogenesis and Glycogenolysis. I want you to include the enzyme in each step and include some important by-products as well. From the illustration, I want you to encircle the intermediate molecule to highlight the link between the two processes. Aside from the illustration, I want you to compare and contrast the two pathways in terms of function, number of reaction steps, and usage of UTP. You can tabulate this part to make it simpler.arrow_forwardA hypothetical three-step metabolic pathway consists of intermediates W, X, Y, and Z and enzymes A, B, and C. Deduce the order of the enzymatic steps in the pathway from the following information: 1. Compound Q, a metabolic inhibitor of enzyme B, causes Z to build up. 2. A mutant in enzyme C requires Y for growth. 3. An inhibitor of enzyme A causes W, Y, and Z to accumulate. 4. Compound P, a metabolic inhibitor of enzyme C, causes W and Z to build up.arrow_forwardIn a biochemical pathway, three ATP molecules are hydrolyzed. The endergonic reactions in the pathway require a total of 17.3 kcal/mole of energy to drive the reactions of the pathway. What is the overall change in free energy of the biochemical pathway? Is the overall pathway endergonic or exergonic?arrow_forward
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