Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 13, Problem 3RQ
Summary Introduction
To review:
The reason for some biochemical reactions to release energy only above a threshold temperature.
Introduction:
A biochemical reaction is a reaction that involves the conversion of a substrate or molecule into the product with the help of enzymes in organisms. The biochemical reactions can be exothermic and endothermic. Exothermic reactions involve the production or release of heat.
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One enzyme-catalyzed reaction in a biochemical cycle has an equilibrium constant
that is 10 times the equilibrium constant of a second reaction. If the standard Gibbs
energy of the former reaction is -300 kJ/mol, what is the standard Gibbs energy of
the second reaction?
Ans: -294 kJ/mol
Why is the regulation of biochemical processes important?List three reasons
What is the activation energy for a reaction? Why is activation energy necessary?
Chapter 13 Solutions
Microbiology: An Evolving Science (Fourth Edition)
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- Why is it somewhat misleading to study biochemical pathways separately?arrow_forwardA biochemical reaction will proceed in the direction as written if: Group of answer choices H > 0. G = zero. H G > 0. Garrow_forwardMany biochemical reactions are non-spontaneous but are required for living organisms. How can they still proceed? A) Lower the temperature of the system. B) Increase the temperature of the system. C) Couple a non-spontaneous reaction with any spontaneous reaction D) Couple two reactions that result in a spontaneous process overall. Please provide only typed answer solution no handwritten solution needed allowedarrow_forward
- a) What is the Steady State assumption; how does steady state differ from equilibrium? b) Transition state; what are two ways that enzymes can decrease the transition state energy?arrow_forwardWhy do you think most biochemical reactions inside our body need to speed up?arrow_forwardHow are biochemically unfavourable reactions able to produce adequate amounts of products?arrow_forward
- In two to three sentences, what are the biochemical features and properties of enzymes?arrow_forwardWhy do most enzyme reactions slow down at extremely high temperatures?arrow_forwardWhich of the following aspects of catalysis by enzymes can NOT be explained by the Fischer Lock and Key Hypothesis? Enzymes will lower the activation energy barrier for reaction. Enzymes will specifically recognize their substrates. Appropriate substrates will bind to the enzyme to form a Michaelis complex. Enzymes have an "active site" where appropriate substrates will be bound. Two of the above cannot be explained by the Fischer "Lock and Key" Hypothesis.arrow_forward
- How Do Enzymes Promote Biochemical Reactions?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_forwardWhich of the following is TRUE under the following conditions: the enzyme concentration is 2.5 nM, substrate concentration is 75 nM, the KM = 150 nM, and the Vmax = 20 nmol/min a) The rate of the reaction is 20 nmol/min! b) The rate of the reaction is between 10 nmol/min and 20 nmol/min. c) The rate of the reaction is 10 nmol/min. d) The rate of the reaction is below 10 nmol/min. e) The rate cannot be determined from the above information.arrow_forward
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