Textbook Question
With what class of enzymes are the coenzymes NAD+ and FAD associated?
Ch.21 The Generation of Biochemical Energy
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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Table of contents
- 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: 9780134015187Not the one you use?Change textbook
Chapter 21, Problem 82
If you use a flame to burn a pile of glucose completely to give carbon dioxide and water, the overall reaction is identical to the metabolic oxidation of glucose. Explain the differences in the fate of the energy released in each case.
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Understand the chemical reaction: The combustion of glucose (C₆H₁₂O₆) in the presence of oxygen (O₂) produces carbon dioxide (CO₂) and water (H₂O). The balanced chemical equation is: . This reaction releases energy in the form of heat and light during combustion.
Compare the energy release in combustion: When glucose is burned in a flame, the energy is released rapidly as heat and light. This is an uncontrolled process where the energy is dissipated into the surroundings, making it unavailable for any biological work.
Compare the energy release in metabolism: In the metabolic oxidation of glucose, the energy is released gradually through a series of enzymatic reactions in the body. This controlled process allows the energy to be captured and stored in the form of adenosine triphosphate (ATP), which is used to power cellular activities.
Explain the role of enzymes in metabolism: Enzymes play a critical role in breaking down glucose step by step in metabolic pathways such as glycolysis, the citric acid cycle, and oxidative phosphorylation. This ensures that the energy is harnessed efficiently rather than being lost as heat.
Summarize the key difference: The primary difference lies in the fate of the energy. In combustion, energy is lost as heat and light, while in metabolism, energy is conserved and stored in ATP, making it available for biological functions.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Combustion of Glucose
The combustion of glucose is a chemical reaction where glucose reacts with oxygen to produce carbon dioxide and water, releasing energy primarily in the form of heat and light. This process is exothermic and occurs rapidly, resulting in a significant release of energy that is not harnessed for biological work.
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Metabolic Oxidation
Metabolic oxidation of glucose refers to the biochemical process by which cells break down glucose in a series of controlled reactions to produce energy in the form of ATP (adenosine triphosphate). This process occurs in a stepwise manner, allowing for the efficient capture and utilization of energy, which is essential for cellular functions.
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Energy Transfer and Utilization
The fate of energy released during combustion is primarily as heat, which dissipates into the environment, while in metabolic oxidation, energy is stored in ATP molecules. This stored energy can then be used for various cellular processes, such as muscle contraction, biosynthesis, and active transport, highlighting the importance of energy transfer mechanisms in living organisms.
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Related Practice
Textbook Question
The citric acid cycle contains four 4-carbon dicarboxylic acids.
a. Name them.
Textbook Question
We talk of burning food in a combustion process, producing CO2 and H2O from food and O2. Explain how O2 is involved in the process although no O2 is directly involved in the citric acid cycle.
Textbook Question
Why must the breakdown of molecules for energy in the body occur in several steps, rather than in one step?
Textbook Question
The mitochondrion pumps H+ from the matrix into the intermembrane space. Which region is more acidic, the matrix or the intermembrane space? Why?
Textbook Question
The citric acid cycle contains four 4-carbon dicarboxylic acids.
b. Arrange them in order from least oxidized to most oxidized.