Respiration and Energy Transfer — Practice Quiz
Maharashtra Board · Class 11 · Biology
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Quick Quiz: Respiration and Energy Transfer
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What is the primary end product of glycolysis?
Where does the Krebs cycle occur in eukaryotic cells?
What is the net ATP gain from glycolysis?
What is the connecting link between glycolysis and the Krebs cycle?
Sample Questions
Which of the following are characteristics of glycolysis? (Select all correct answers)
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Occurs in the cytoplasm, Produces 2 ATP molecules (net gain), Common to both aerobic and anaerobic respiration, Produces 2 NADH+H+ molecules
Glycolysis occurs in the cytoplasm of all cells and does not require oxygen, making it anaerobic. It produces 4 ATP but consumes 2 ATP, giving a net gain of 2 ATP. It also produces 2 NADH+H+ molecules. Since it doesn't require oxygen, it is common to both aerobic and anaerobic respiration pathways. The statement 'requires oxygen' is incorrect because glycolysis is an anaerobic process.
Which processes are involved in aerobic respiration? (Select all correct answers)
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Glycolysis, Krebs cycle, Electron transport chain, Formation of Acetyl CoA
Aerobic respiration consists of four main stages: glycolysis (breakdown of glucose to pyruvic acid), formation of Acetyl CoA (connecting link reaction), Krebs cycle (complete oxidation of acetyl CoA), and electron transport chain (ATP synthesis). Fermentation is part of anaerobic respiration, not aerobic respiration, as it occurs when oxygen is absent and involves incomplete oxidation of glucose.
Which molecules can serve as electron acceptors in the electron transport chain? (Select all correct answers)
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Oxygen, NAD+, FAD+
In the electron transport chain, oxygen is the final electron acceptor that gets reduced to water. NAD+ and FAD+ are electron acceptors that get reduced to NADH+H+ and FADH2 respectively during various metabolic reactions. NADH+H+ and FADH2 are electron donors, not acceptors - they donate electrons to the transport chain and get oxidized back to NAD+ and FAD+.
Which features are characteristic of anaerobic respiration? (Select all correct answers)
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Does not require oxygen, Also called fermentation, Produces less ATP than aerobic respiration, Can produce lactic acid or ethanol
Anaerobic respiration does not require oxygen and is also called fermentation. It produces only 2 ATP molecules compared to 38 ATP in aerobic respiration, making it less efficient. Depending on the organism, it can produce lactic acid (in muscles) or ethanol (in yeast). It does not completely oxidize glucose - this is incorrect because glucose is only partially broken down in anaerobic respiration, unlike aerobic respiration where glucose is completely oxidized to CO2 and water.
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