Q1. Which of the following enzymes is involved in the first step of the Krebs cycle?A. HexokinaseB. Citrate synthaseC. Pyruvate dehydrogenaseD. ATP synthase
Q2. Which of the following molecules is required for the conversion of pyruvate to Acetyl-CoA?A. ATPB. NAD⁺C. FADH₂D. Oxygen
Q3. Which process in respiration directly produces ATP without the involvement of the electron transport chain?A. GlycolysisB. Krebs cycleC. Oxidative phosphorylationD. Electron Transport Chain
Q4. During aerobic respiration, where does oxidative phosphorylation take place?A. CytoplasmB. Outer mitochondrial membraneC. Inner mitochondrial membraneD. Nucleus
Q5. Which molecule serves as the immediate energy source for cellular activities?A. NADHB. ATPC. GlucoseD. FADH₂
Q6. Which process releases the least amount of energy per molecule of glucose?A. Aerobic respirationB. Krebs cycleC. FermentationD. Electron Transport Chain
Q7. Which of the following statements about glycolysis is INCORRECT?A. It occurs in the cytoplasm.B. It results in the production of pyruvate.C. It requires oxygen to proceed.D. It is the first step in both aerobic and anaerobic respiration.
Q8. Which compound is the immediate precursor of Acetyl-CoA in respiration?A. GlucoseB. PyruvateC. OxaloacetateD. Citrate
Q9. Which structure in plants facilitates oxygen intake and carbon dioxide release?A. CuticleB. LenticelsC. XylemD. Phloem
Q10. Which of the following statements about the respiratory quotient (RQ) is INCORRECT?A. RQ for carbohydrates is 1.B. RQ for fats is greater than 1.C. RQ for proteins is less than 1.D. RQ value depends on the type of respiratory substrate used.