Textbook Question
Which of the following compounds has the greatest amount of energy for a cell?
a. CO2
b. ATP
c. glucose
d. O2
e. lactic acid
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Ch. 5 - Microbial Metabolism
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398
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Table of contents
- Ch. 1 - The Microbial World and You18
- Ch. 2 - Chemical Principles20
- Ch. 3 - Observing Microorganisms Through a Microscope18
- Ch. 4 - Functional Anatomy of Prokaryotic and Eukaryotic Cells21
- Ch. 5 - Microbial Metabolism20
- Ch. 6 - Microbial Growth20
- Ch. 7 - The Control of Microbial Growth20
- Ch. 8 - Microbial Genetics19
- Ch. 9 - Biotechnology & DNA Technology20
- Ch. 10 - Classification of Microorganisms15
- Ch. 11 - The Prokaryotes: Domains Bacteria and Archaea14
- Ch. 12 - The Eukaryotes: Fungi, Algae, Protozoa, and Helminths17
- Ch. 13 - Viruses, Viroids, and Prions20
- Ch. 14 - Principles of Disease and Epidemiology21
- Ch. 15 - Microbial Mechanisms of Pathogenicity19
- Ch. 16 - Innate Immunity: Nonspecific Defenses of the Host20
- Ch. 17 - Adaptive Immunity: Specific Defenses of the Host20
- Ch. 18 - Practical Applications of Immunology20
- Ch. 19 - Disorders Associated with the Immune System19
- Ch. 20 - Antimicrobial Drugs19
- Ch. 21 - Microbial Diseases of the Skin and Eyes21
- Ch. 22 - Microbial Diseases of the Nervous System19
- Ch. 23 - Microbial Diseases of the Cardiovascular and Lymphatic Systems20
- Ch. 24 - Microbial Diseases of the Respiratory System20
- Ch. 25 - Microbial Diseases of the Digestive System20
- Ch. 26 - Microbial Diseases of the Urinary and Reproductive Systems19
- Ch. 27 - Environmental Microbiology20
- Ch. 28 - Applied and Industrial Microbiology19
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398Not the one you use?Change textbook
Chapter 5, Problem 5
Which of the following is the best definition of the Krebs cycle?
a. The oxidation of pyruvic acid
b. The way cells produce CO2
c. A series of chemical reactions in which NADH is produced from the oxidation of pyruvic acid
d. A method of producing ATP by phosphorylating ADP
e. A series of chemical reactions in which ATP is produced from the oxidation of pyruvic acid
Verified step by step guidance1
Step 1: Understand the context of the Krebs cycle, also known as the citric acid cycle or TCA cycle, which is a key metabolic pathway in cellular respiration.
Step 2: Recall that the Krebs cycle involves a series of chemical reactions that take place in the mitochondrial matrix, where acetyl-CoA (derived from pyruvic acid) is oxidized.
Step 3: Identify the main products of the Krebs cycle, which include NADH, FADH₂, ATP (or GTP), and CO₂ as a byproduct.
Step 4: Note that the Krebs cycle's primary role is to generate high-energy electron carriers (NADH and FADH₂) by oxidizing acetyl-CoA, which then feed into the electron transport chain for further ATP production.
Step 5: Compare the given options to this understanding, focusing on the description that best captures the series of chemical reactions producing NADH from the oxidation of pyruvic acid derivatives.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Krebs Cycle Overview
The Krebs cycle, also known as the citric acid cycle, is a series of enzyme-catalyzed chemical reactions in the mitochondrial matrix that oxidize acetyl-CoA derived from pyruvic acid. It plays a central role in cellular respiration by generating electron carriers like NADH and FADH2, which are essential for ATP production.
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01:37
Krebs Cycle
Role of NADH in Cellular Respiration
NADH is a key electron carrier produced during the Krebs cycle by the oxidation of substrates like pyruvic acid. It transports high-energy electrons to the electron transport chain, where these electrons help drive the production of ATP through oxidative phosphorylation.
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07:51Review of Aerobic Cellular Respiration
ATP Production and Phosphorylation
ATP is the primary energy currency of the cell, produced mainly through oxidative phosphorylation in the electron transport chain. While the Krebs cycle generates some ATP (or GTP) directly, its main function is to produce NADH and FADH2, which fuel the larger ATP production process.
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Related Practice
Textbook Question
All of the energy-producing biochemical reactions that occur in cells, such as photophosphorylation and glycolysis, are ________ reactions.
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Textbook Question
Use the following choices to answer the question.
a. E. coli growing in glucose broth at 35℃ with O2 for 5 days
b. E. coli growing in glucose broth at 35℃ without O2 for 5 days
c. Both a and b
d. Neither a nor b
Which culture produces the most lactic acid?
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Textbook Question
Define oxidation-reduction, and differentiate the following terms:
a. Aerobic and anaerobic respiration
b. Respiration and fermentation
c. Cyclic and noncyclic photophosphorylation
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Textbook Question
There are three mechanisms for the phosphorylation of ADP to produce ATP. Write the name of the mechanism that describes each of the reactions in the following table.
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Textbook Question
Which of the following is the best definition of cellular respiration?
a. A sequence of redox reactions with O2 as the final electron acceptor
b. A sequence of redox reactions with the final electron acceptor from the environment
c. A method of generating ATP
d. The complete oxidation of glucose to CO2 and H2O
e. A series of reactions in which pyruvic acid is oxidized to CO2 and H2O
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