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Questions and Answers
Which molecule is metabolized in a cell to produce energy currency in the form of ATP?
Which molecule is metabolized in a cell to produce energy currency in the form of ATP?
The potential energy in an ATP molecule is derived mainly from its three phosphate groups.
The potential energy in an ATP molecule is derived mainly from its three phosphate groups.
True
Which process is not part of the cellular respiration pathway that produces large amounts of ATP in a cell?
Which process is not part of the cellular respiration pathway that produces large amounts of ATP in a cell?
Which step of the cellular respiration pathway can take place in the absence of oxygen?
Which step of the cellular respiration pathway can take place in the absence of oxygen?
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Into which molecule are all the carbon atoms in glucose ultimately incorporated during cellular respiration?
Into which molecule are all the carbon atoms in glucose ultimately incorporated during cellular respiration?
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Which of the following statements about the electron transport chain is true?
Which of the following statements about the electron transport chain is true?
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Which stage of glucose metabolism produces the most ATP?
Which stage of glucose metabolism produces the most ATP?
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The reactions that generate the largest amounts of ATP during cellular respiration take place in the mitochondria.
The reactions that generate the largest amounts of ATP during cellular respiration take place in the mitochondria.
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The primary role of oxygen in cellular respiration is to _____.
The primary role of oxygen in cellular respiration is to _____.
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In chemiosmosis, what is the most direct source of energy that is used to convert ADP + Pi to ATP?
In chemiosmosis, what is the most direct source of energy that is used to convert ADP + Pi to ATP?
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Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?
Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?
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The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is _____.
The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is _____.
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Select the correct statement about cellular respiration.
Select the correct statement about cellular respiration.
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What process occurs in Box A?
What process occurs in Box A?
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What process occurs within Box B?
What process occurs within Box B?
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What molecule is indicated by the letter D?
What molecule is indicated by the letter D?
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Substrate-level phosphorylation occurs _____.
Substrate-level phosphorylation occurs _____.
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The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction _____.
The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction _____.
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Which of the listed statements describes the results of the following reaction: C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy?
Which of the listed statements describes the results of the following reaction: C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy?
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When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the molecule becomes _____.
When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the molecule becomes _____.
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When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a proton), the molecule becomes _____.
When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a proton), the molecule becomes _____.
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The oxygen consumed during cellular respiration is involved directly in which process?
The oxygen consumed during cellular respiration is involved directly in which process?
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How many NADH are produced by glycolysis?
How many NADH are produced by glycolysis?
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In glycolysis, ATP molecules are produced by _____.
In glycolysis, ATP molecules are produced by _____.
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Which of these is NOT a product of glycolysis?
Which of these is NOT a product of glycolysis?
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In glycolysis, what starts the process of glucose oxidation?
In glycolysis, what starts the process of glucose oxidation?
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In glycolysis, there is a net gain of _____ ATP.
In glycolysis, there is a net gain of _____ ATP.
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Glycolysis takes place in the _________________, whereas the Krebs cycle and the electron transport chain, which generate the largest amounts of ATP during cellular respiration, take place in the __________________.
Glycolysis takes place in the _________________, whereas the Krebs cycle and the electron transport chain, which generate the largest amounts of ATP during cellular respiration, take place in the __________________.
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Study Notes
Cellular Respiration Overview
- Energy currency of the cell is ATP, produced primarily from glucose metabolism.
- The potential energy in ATP arises chiefly from its three phosphate groups.
ATP Production Processes
- Glycolysis occurs in the cytoplasm and can function without oxygen.
- Krebs cycle and electron transport chain occur in mitochondria and yield the most ATP.
Carbon Dioxide and Glucose
- All carbon atoms from glucose are converted into carbon dioxide during cellular respiration.
Electron Transport Chain (ETC)
- NADH and FADH2 provide electrons to the ETC.
- Oxygen acts as the final electron acceptor, combining with electrons and protons to form water.
Chemiosmosis
- ATP is generated through chemiosmosis as protons flow down their electrochemical gradient via ATP synthase.
Comparisons of Metabolic Pathways
- Glycolysis is a common pathway in both fermentation and cellular respiration.
- Substrate-level phosphorylation occurs in both glycolysis and the citric acid cycle, enabling direct ATP synthesis.
Metabolic Products
- Glycolysis generates NADH, pyruvate, and ATP; FADH2 is not produced in this process.
- A net gain of ATP from glycolysis is 2 molecules per glucose.
Oxidation-Reduction Reactions
- In redox reactions, a molecule losing a hydrogen atom is oxidized.
- NAD+ is reduced to NADH when it gains a hydrogen atom.
Key Reactions and Processes
- The equation C6H12O6 + 6 O2 → 6 CO2 + 6 H2O represents the oxidation of glucose and reduction of oxygen.
- Oxygen's primary role in aerobic respiration is accepting electrons at the end of the electron transport chain.
Summary of Key Metabolic Facts
- Cellular respiration occurs at the cellular level, contrasting with breathing at the organismal level.
- All ATP production pathways and metabolic processes are essential for energy homeostasis in cells.
Studying That Suits You
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Description
Test your knowledge on cellular energy production with these flashcards from Biology Module 7. Learn about ATP, its role in metabolism, and the processes involved in cellular respiration. Perfect for students looking to master key concepts in biochemistry.
