Questions and Answers
What are the 3 phases of the cellular respiration process?
Glycolysis, the Krebs Cycle, the electron transport chain
Where in the cell does the glycolysis part of cellular respiration occur?
Cytoplasm
Where in the cell does the Krebs (Citric Acid) cycle part of cellular respiration occur?
Mitochondrial matrix
Where in the cell does the electron transport part of cellular respiration occur?
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How many ATP (net) are made in the glycolysis part of cellular respiration?
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How many ATP are made in the Krebs cycle part of cellular respiration?
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How many ATP are made in the electron transport part of cellular respiration?
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In which phase of cellular respiration is carbon dioxide made?
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In which phase of cellular respiration is water made?
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In which phase of cellular respiration is oxygen a substrate?
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In which phase of cellular respiration is glucose a substrate?
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On average, how many ATP can be made from each NADH during the electron transport process?
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On average, how many ATP can be made from each FADH2 during the electron transport process?
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What would happen to the cellular respiration process if the enzyme for one step of the process were missing or defective?
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What happens to the high-energy electrons (and hydrogen) held by NADH if there is no O2 present?
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What is the overall reaction for fermentation in yeast?
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What is the overall reaction for lactic acid fermentation?
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Study Notes
Phases of Cellular Respiration
- Three main phases are glycolysis, the Krebs Cycle, and the electron transport chain.
Location of Processes
- Glycolysis occurs in the cytoplasm.
- The Krebs Cycle takes place in the mitochondrial matrix.
- The electron transport chain is located in the inner membrane of mitochondria.
ATP Production
- Glycolysis yields a net gain of 2 ATP.
- The Krebs Cycle also produces 2 ATP.
- The electron transport chain generates 34 ATP, making it the most productive phase.
Byproducts of Cellular Respiration
- Carbon dioxide is produced during the Krebs Cycle.
- Water is formed in the electron transport chain.
Substrates in Cellular Respiration
- Glucose serves as the substrate in glycolysis.
- Oxygen acts as a substrate in the electron transport chain.
NADH and FADH2
- Each NADH can produce about 3 ATP in the electron transport chain.
- Each FADH2 yields approximately 2 ATP during the process.
Enzyme Deficiency Impact
- Missing or defective enzymes at any step of cellular respiration will halt processes beyond that point.
Anaerobic Conditions
- In the absence of oxygen, pyruvic acid accepts high-energy electrons from NADH.
Fermentation Reactions
- Yeast fermentation reaction: Glucose converts to ethyl alcohol, carbon dioxide, 2 ATP, and heat.
- Lactic acid fermentation reaction: Glucose converts to lactic acid, 2 ATP, and heat.
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Description
Test your knowledge on cellular respiration with these flashcards. Learn about the three phases of the process, where glycolysis and the Krebs cycle occur, and other essential details related to cellular energy production.
