Q1. Which molecule is regenerated at the end of the Krebs cycle?A. CitrateB. Acetyl-CoAC. OxaloacetateD. Pyruvate
Q2. Which of the following correctly represents the overall equation for aerobic respiration?A. C₆H₁₂O₆ + O₂ → CO₂ + H₂O + EnergyB. C₆H₁₂O₆ → Lactic acid + EnergyC. C₆H₁₂O₆ → Ethanol + CO₂ + EnergyD. C₆H₁₂O₆ → Acetyl-CoA + CO₂
Q3. Which of the following is INCORRECT about substrate-level phosphorylation?A. It occurs in glycolysis.B. It occurs in the Krebs cycle.C. It requires the Electron Transport Chain.D. It directly produces ATP from ADP.
Q4. What is the Respiratory Quotient (RQ) value when fats are used as a respiratory substrate?A. 1.0B. 0.9C. 0.8D. Less than 1
Q5. Which of the following pathways is considered amphibolic?A. GlycolysisB. Krebs cycleC. FermentationD. Electron Transport Chain
Q6. Which of the following molecules acts as the final electron acceptor in aerobic respiration?A. NAD⁺B. FADH₂C. OxygenD. ATP
Q7. Which of the following statements is TRUE about ATP?A. It is stored in large quantities in cellsB. It releases energy when converted to ADPC. It is synthesized only in mitochondriaD. It is not required for active transport
Q8. Which of the following respiratory substrates has the highest Respiratory Quotient (RQ)?A. GlucoseB. FatsC. ProteinsD. Organic acids
Q9. What is the function of NADH and FADH₂ in cellular respiration?A. Directly produce ATPB. Act as final electron acceptorsC. Donate electrons to the Electron Transport ChainD. Break down glucose in glycolysis
Q10. Which of the following statements about oxidative phosphorylation is INCORRECT?A. It takes place in the inner mitochondrial membrane.B. It generates ATP using a proton gradient.C. It occurs before the Krebs cycle.D. It requires oxygen as the final electron acceptor.