Textbook Question
How is NADH oxidized in electron transport?
Ch.18 Metabolic Pathways and ATP Production
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353
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Table of contents
- Ch.1 Chemistry in Our Lives11
- Ch.2 Chemistry and Measurements80
- Ch.3 Matter and Energy54
- Ch.4 Atoms and Elements51
- Ch.5 Nuclear Chemistry42
- Ch.6 Ionic and Molecular Compounds57
- Ch.7 Chemical Quantities and Reactions41
- Ch.8 Gases29
- Ch.9 Solutions51
- Ch.10 Acids and Bases and Equilibrium65
- Ch.11 Introduction to Organic Chemistry: Hydrocarbons78
- Ch.12 Alcohols, Thiols, Ethers, Aldehydes, and Ketones83
- Ch.13 Carbohydrates54
- Ch.14 Carboxylic Acids, Esters, Amines, and Amides90
- Ch.15 Lipids61
- Ch.16 Amino Acids, Proteins, and Enzymes84
- Ch.17 Nucleic Acids and Protein Synthesis83
- Ch.18 Metabolic Pathways and ATP Production67
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353Not the one you use?Change textbook
Chapter 18, Problem 42b
Refer to the diagram of the citric acid cycle in Figure 18.13 to answer each of the following:
b. What are the four-carbon compounds?
Verified step by step guidance1
Step 1: Begin by understanding the citric acid cycle (also known as the Krebs cycle or TCA cycle). It is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.
Step 2: Refer to Figure 18.13 of the citric acid cycle diagram. Identify the compounds involved in the cycle, paying close attention to the molecular structures and carbon counts of each compound.
Step 3: Focus on the compounds that have four carbon atoms. These are intermediates in the cycle and play a key role in the transfer of energy and electrons.
Step 4: Note that the four-carbon compounds in the citric acid cycle include oxaloacetate, succinate, fumarate, and malate. These compounds are involved in different steps of the cycle, such as regeneration of oxaloacetate and conversion of succinate to fumarate.
Step 5: Understand the role of these four-carbon compounds in the cycle. For example, oxaloacetate combines with acetyl-CoA to form citrate, and fumarate is formed during the oxidation of succinate. This helps in understanding the flow of carbon atoms and energy within the cycle.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Citric Acid Cycle
The citric acid cycle, also known as the Krebs cycle, is a key metabolic pathway that takes place in the mitochondria. It involves a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins. The cycle produces energy-rich molecules such as ATP, NADH, and FADH2, which are essential for cellular respiration.
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Four-Carbon Compounds
In the context of the citric acid cycle, four-carbon compounds play a crucial role in the cycle's progression. Notable four-carbon intermediates include succinate and oxaloacetate. These compounds are involved in various steps of the cycle, facilitating the conversion of energy and the regeneration of the cycle's starting material, which is essential for continuous operation.
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Metabolic Intermediates
Metabolic intermediates are the various compounds formed during the metabolic pathways, including the citric acid cycle. They serve as substrates for subsequent reactions and are vital for the regulation of metabolic processes. Understanding these intermediates, such as the four-carbon compounds, helps in grasping how energy is produced and utilized in cellular metabolism.
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Related Practice
Textbook Question
Refer to the diagram of the citric acid cycle in Figure 18.13 to answer each of the following:
b. How is the number of carbon atoms decreased?
Textbook Question
Refer to the diagram of the citric acid cycle in Figure 18.13 to answer each of the following:
d. What are the decarboxylation reactions?
Textbook Question
What happens to the energy level as electrons are passed along in electron transport?
Textbook Question
What is the total NADH and total FADH2 produced in one turn of the citric acid cycle?
Textbook Question
Refer to the diagram of the citric acid cycle in Figure 18.13 to answer each of the following:
d. In which reactions are secondary alcohols oxidized?