- Which enzyme is responsible for fixing carbon dioxide in the Calvin cycle?
- a) RuBisCO
- b) ATP synthase
- c) Phosphofructokinase
- d) Hexokinase
Answer: a) RuBisCO
- What is the function of ATP synthase in cellular respiration?
- a) Breaks down glucose
- b) Synthesizes ATP from ADP and inorganic phosphate
- c) Transport electrons
- d) Fixes carbon dioxide
Answer: b) Synthesizes ATP from ADP and inorganic phosphate
- Which enzyme catalyzes the first step of the Calvin cycle, the fixation of CO₂ to ribulose bisphosphate?
- a) Phosphoglycerate kinase
- b) Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO)
- c) Malate dehydrogenase
- d) Glyceraldehyde-3-phosphate dehydrogenase
Answer: b) Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO)
- In glycolysis, which enzyme catalyzes the conversion of glucose to glucose-6-phosphate?
- a) Phosphoglucose isomerase
- b) Hexokinase
- c) Phosphofructokinase
- d) Aldolase
Answer: b) Hexokinase
- Which enzyme is responsible for the production of NADPH in the light-dependent reactions of photosynthesis?
- a) NADP+ reductase
- b) ATP synthase
- c) RuBisCO
- d) Cytochrome c reductase
Answer: a) NADP+ reductase
- Which enzyme catalyzes the reduction of 3-phosphoglycerate to glyceraldehyde-3-phosphate in the Calvin cycle?
- a) Phosphoglycerate kinase
- b) Glyceraldehyde-3-phosphate dehydrogenase
- c) RuBisCO
- d) Transketolase
Answer: b) Glyceraldehyde-3-phosphate dehydrogenase
- Which enzyme facilitates the breakdown of glucose into two molecules of pyruvate during glycolysis?
- a) Hexokinase
- b) Phosphofructokinase
- c) Aldolase
- d) Pyruvate kinase
Answer: c) Aldolase
- Which enzyme is responsible for converting pyruvate into acetyl-CoA in the mitochondria?
- a) Pyruvate dehydrogenase
- b) Hexokinase
- c) Citrate synthase
- d) Malate dehydrogenase
Answer: a) Pyruvate dehydrogenase
- Which enzyme catalyzes the synthesis of ATP in the final step of oxidative phosphorylation?
- a) ATP synthase
- b) Cytochrome c oxidase
- c) NADH dehydrogenase
- d) Succinate dehydrogenase
Answer: a) ATP synthase
- Which enzyme is involved in the fixation of atmospheric nitrogen in nitrogen-fixing bacteria during the process of nitrogen fixation?
- a) Nitrogenase
- b) RuBisCO
- c) ATP synthase
- d) Amylase
Answer: a) Nitrogenase
- Which enzyme is involved in the synthesis of glucose from pyruvate during gluconeogenesis?
- a) Hexokinase
- b) Phosphoenolpyruvate carboxykinase
- c) Pyruvate kinase
- d) Aldolase
Answer: b) Phosphoenolpyruvate carboxykinase
- Which enzyme in the citric acid cycle catalyzes the conversion of citrate to isocitrate?
- a) Citrate synthase
- b) Aconitase
- c) Malate dehydrogenase
- d) Succinate dehydrogenase
Answer: b) Aconitase
- Which enzyme is crucial for the reduction of NADP+ to NADPH in the light-dependent reactions of photosynthesis?
- a) NADP+ reductase
- b) ATP synthase
- c) Cytochrome c oxidase
- d) Ribulose bisphosphate carboxylase
Answer: a) NADP+ reductase
- Which enzyme helps in the production of acetyl-CoA from pyruvate in aerobic respiration?
- a) Pyruvate dehydrogenase
- b) Citrate synthase
- c) Succinate dehydrogenase
- d) Lactate dehydrogenase
Answer: a) Pyruvate dehydrogenase
- Which enzyme is responsible for the conversion of ribulose-1,5-bisphosphate to 3-phosphoglycerate in the Calvin cycle?
- a) RuBisCO
- b) Phosphoglycerate kinase
- c) Aldolase
- d) Glyceraldehyde-3-phosphate dehydrogenase
Answer: a) RuBisCO
- Which enzyme in the electron transport chain accepts electrons from NADH?
- a) NADH dehydrogenase
- b) Cytochrome c oxidase
- c) Cytochrome b-c1 complex
- d) ATP synthase
Answer: a) NADH dehydrogenase
- Which enzyme is responsible for synthesizing ribulose-1,5-bisphosphate during the Calvin cycle?
- a) Ribulose-5-phosphate kinase
- b) RuBisCO
- c) Glyceraldehyde-3-phosphate dehydrogenase
- d) ATP synthase
Answer: a) Ribulose-5-phosphate kinase
- Which enzyme converts phosphoenolpyruvate to oxaloacetate in the citric acid cycle?
- a) Phosphoenolpyruvate carboxylase
- b) Pyruvate kinase
- c) Citrate synthase
- d) Malate dehydrogenase
Answer: a) Phosphoenolpyruvate carboxylase
- Which enzyme is involved in the regeneration of RuBP in the Calvin cycle?
- a) Phosphoribulokinase
- b) Glyceraldehyde-3-phosphate dehydrogenase
- c) RuBisCO
- d) Ribulose-5-phosphate isomerase
Answer: a) Phosphoribulokinase
- Which enzyme catalyzes the final step in glycolysis, converting phosphoenolpyruvate to pyruvate?
- a) Pyruvate kinase
- b) Aldolase
- c) Phosphofructokinase
- d) Hexokinase
Answer: a) Pyruvate kinase
- In photosynthesis, which enzyme is responsible for the production of oxygen from water molecules?
- a) Oxygen-evolving complex (OEC)
- b) ATP synthase
- c) NADP+ reductase
- d) Cytochrome b6f complex
Answer: a) Oxygen-evolving complex (OEC)
- Which enzyme converts 3-phosphoglycerate to 1,3-bisphosphoglycerate in the Calvin cycle?
- a) Glyceraldehyde-3-phosphate dehydrogenase
- b) Phosphoglycerate kinase
- c) RuBisCO
- d) Transketolase
Answer: b) Phosphoglycerate kinase
- What is the role of the enzyme NADH dehydrogenase in cellular respiration?
- a) It transfers electrons from NADH to the electron transport chain
- b) It synthesizes ATP
- c) It converts glucose into pyruvate
- d) It regulates the citric acid cycle
Answer: a) It transfers electrons from NADH to the electron transport chain
- Which enzyme in the citric acid cycle converts succinate to fumarate?
- a) Fumarase
- b) Succinate dehydrogenase
- c) Aconitase
- d) Malate dehydrogenase
Answer: b) Succinate dehydrogenase
- Which enzyme is responsible for the production of citric acid from acetyl-CoA and oxaloacetate?
- a) Citrate synthase
- b) Malate dehydrogenase
- c) Pyruvate kinase
- d) NADH dehydrogenase
Answer: a) Citrate synthase
- Which enzyme catalyzes the decarboxylation of isocitrate to alpha-ketoglutarate in the citric acid cycle?
- a) Isocitrate dehydrogenase
- b) Citrate synthase
- c) Aconitase
- d) Malate dehydrogenase
Answer: a) Isocitrate dehydrogenase
- Which enzyme is involved in the conversion of malate to oxaloacetate in the citric acid cycle?
- a) Malate dehydrogenase
- b) Aconitase
- c) Succinate dehydrogenase
- d) NADH dehydrogenase
Answer: a) Malate dehydrogenase
- Which enzyme is responsible for reducing oxygen to water in the electron transport chain?
- a) Cytochrome c oxidase
- b) ATP synthase
- c) NADH dehydrogenase
- d) Cytochrome b-c1 complex
Answer: a) Cytochrome c oxidase
- Which enzyme is responsible for catalyzing the splitting of water molecules in the light-dependent reactions of photosynthesis?
- a) Water-splitting complex (Oxygen-evolving complex)
- b) Cytochrome b6f complex
- c) RuBisCO
- d) NADP+ reductase
Answer: a) Water-splitting complex (Oxygen-evolving complex)
- Which enzyme catalyzes the conversion of pyruvate into lactate in anaerobic conditions?
- a) Lactate dehydrogenase
- b) Pyruvate kinase
- c) Phosphofructokinase
- d) Hexokinase
Answer: a) Lactate dehydrogenase
MCQs on Enzymes in Photosynthesis and Respiration
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