Q1. Which enzyme catalyzes the first irreversible step in glycolysis?A. HexokinaseB. AldolaseC. EnolaseD. Pyruvate kinase
Q2. Which pathway is also known as the EMP pathway?A. Krebs cycleB. Electron Transport ChainC. GlycolysisD. Oxidative Phosphorylation
Q3. How many molecules of carbon dioxide are released from one molecule of glucose during aerobic respiration?A. 2B. 4C. 6D. 8
Q4. Which of the following molecules is the first stable compound formed in the Krebs cycle?A. Succinic acidB. Fumaric acidC. Citric acidD. Malic acid
Q5. Which of the following is INCORRECT about the Krebs cycle?A. It takes place in the mitochondrial matrix.B. It produces NADH and FADH₂.C. Glucose enters the Krebs cycle directly.D. CO₂ is released during the cycle.
Q6. Which step of respiration takes place in the cytoplasm of a cell?A. GlycolysisB. Krebs’ cycleC. Electron Transport SystemD. Oxidative Phosphorylation
Q7. Which of the following statements about fermentation is INCORRECT?A. It occurs in the absence of oxygen.B. It takes place in the mitochondria.C. It produces ethanol or lactic acid.D. It generates much less ATP than aerobic respiration.
Q8. Which of the following statements about ATP is CORRECT?A. ATP is an energy-storing molecule.B. ATP is a protein enzyme.C. ATP is only produced during glycolysis.D. ATP is not involved in active transport.
Q9. Which molecule acts as the final hydrogen acceptor in aerobic respiration?A. NAD⁺B. FADH₂C. OxygenD. Water
Q10. Which molecule is the primary substrate for cellular respiration?A. ProteinB. LipidC. GlucoseD. Nucleic Acid