Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
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Chapter 6.3, Problem 2CC
Summary Introduction

To determine:

Whether “glutamic acid + ammonia + ATP” or “glutamine + ATP +Pi” has more free energy.

Concept introduction:

Gibbs free energy is the energy present in the system that can perform work under the condition of uniform temperature and pressure. It is denoted by G.

In a chemical reaction, change in free energy of initial and final state is represented by ΔG . If ΔG is negative then the reaction will proceed spontaneously and if it is positive the reaction will require input of energy from outside to proceed.

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Consider the following chemical reaction: Glucose + ATP → Glucose-6-Phosphate + ADP + Pi Given the following information, calculate the actual free energy change (G’) of this reaction. G’ of Glucose + ATP → Glucose-6-Phosphate + ADP + Pi = -16.7 kJ/mol [Glucose] = 5.0 mM [ATP] = 1.85 mM [Glucose-6-Phosphate] = 0.083 mM [ADP] = 0.14 mM [Pi] = 1.0 mM Temperature = 37 C R (Gas Constant) = 8.314 J/mol•K
As a result of an experiment following measurements were obtained from a cell: ATP concentration of 0.5 mM, ADP concentration of 0.1 mM, inorganic phosphate (Pi) concentration of 2 mM. Under these conditions calculate the actual free energy (AG) of the reaction of hydrolysis of ATP to ADP and Pi. (The standard energy (AG") of ATP = -31 kl/mol; RT = 2.58 kJ/mol) Select one: a. -28 kJ/mol b. -33 kJ/mol C. -42 kJ/mol d. -19 kJ/mol
The hydrolysis of the disaccharide sucrose results in the formation of the monosaccharides glucose and fructose, and the AG of this reaction is -29.3 kJ/mol. Sucrase is an enzyme that is able to catalyze the hydrolysis of sucrose. Which of the following statement(s) correctly describes what would happen if you added the enzyme sucrase to a solution of sucrose? All of the other three statements are correct. The activation energy of the reaction would increase. The AG of the reaction would become more negative (i.e., a larger negative number). The rate of sucrose hydrolysis would increase.
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