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What energy requirements must be met in order for a reaction to be favorable?
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Ch.21 The Generation of Biochemical Energy
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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TOC.tableOfContents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 21, Problema 29
Why is ∆G a useful quantity for predicting the favorability of biochemical reactions?
Guida verificata passo dopo passo1
Understand that ∆G, or Gibbs free energy change, is a thermodynamic quantity that combines enthalpy (∆H), entropy (∆S), and temperature (T) to determine the spontaneity of a reaction. The formula is: .
Recognize that a negative ∆G value indicates a spontaneous reaction under the given conditions, meaning the reaction is thermodynamically favorable and can proceed without external energy input.
Note that ∆G provides insight into both the energy changes (enthalpy) and the disorder (entropy) of a system, making it particularly useful for understanding complex biochemical reactions where both factors are important.
Understand that in biochemical systems, ∆G can predict whether a reaction will occur under physiological conditions, which is critical for processes like metabolism, enzyme activity, and energy transfer.
Realize that ∆G also helps in determining equilibrium positions and the extent to which a reaction will proceed, which is essential for understanding reaction dynamics in living organisms.
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Gibbs Free Energy (∆G)
Gibbs Free Energy (∆G) is a thermodynamic potential that measures the maximum reversible work obtainable from a thermodynamic system at constant temperature and pressure. It is a crucial indicator of the spontaneity of a reaction; a negative ∆G value suggests that a reaction can occur spontaneously, while a positive value indicates that the reaction is non-spontaneous under standard conditions.
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Percorso guidato
01:04
Gibbs Free Energy (Simplified) Concept 3
Spontaneity of Reactions
The spontaneity of a reaction refers to its tendency to proceed without external influence. This is determined by the sign of ∆G: reactions with a negative ∆G are spontaneous, meaning they can occur naturally, while those with a positive ∆G require energy input to proceed. Understanding spontaneity helps predict whether a biochemical reaction will occur in living organisms.
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06:17Spontaneous Reaction Concept 1
Thermodynamic Equilibrium
Thermodynamic equilibrium is the state in which a system's macroscopic properties remain constant over time, indicating that the forward and reverse reactions occur at equal rates. At equilibrium, ∆G equals zero, meaning there is no net change in the concentrations of reactants and products. This concept is essential for understanding how biochemical reactions can shift in response to changes in conditions, such as concentration and temperature.
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01:18First Law of Thermodynamics
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The reaction that follows is catalyzed by isocitrate dehydrogenase and occurs in two steps, the first of which (step A) is formation of an unstable intermediates (shown in brackets).
d. To what class of enzymes does isocitrate dehydrogenase, the enzyme that catalyzes this reaction, belong?
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Domanda del libro di testo
What is the difference between catabolism and anabolism?
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Domanda del libro di testo
The following reactions occur during the catabolism of acetyl-CoA. Which are exergonic? Which is endergonic? Which reaction produces a phosphate that later yields energy by giving up a phosphate group?
c. L-Malate + NAD+ → Oxaloacetate + NADH + H+
∆G = +17 kcal/mol (+129.3 kJ/mol)
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Domanda del libro di testo
The electron-transport chain uses several different metal ions, especially iron, copper, zinc, and manganese. Why are metals used frequently in these two pathways? What can metals do better than organic biomolecules?
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Domanda del libro di testo
The following reactions occur during the catabolism of glucose. Which are exergonic? Which is endergonic? Which proceeds farthest toward products at equilibrium?
b. Phosphoenol pyruvate + H2O → Pyruvate + Phosphate(Pi)
∆G = –14.8 kcal/mol (–61.9 kJ/mol)
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