Complete Exam Guide Subject-wise practice platform
Respiration in Plants

Krebs Cycle (TCA): Steps and Significance Practice Questions

20 free Krebs Cycle (TCA): Steps and Significance practice questions for the NCERT Biology, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.

Start Practice Quiz

Questions

All Krebs Cycle (TCA): Steps and Significance questions

20 questions
  1. Q1. Before entering the Krebs cycle, pyruvate undergoes oxidative decarboxylation to form which 2-carbon compound?
  2. Q2. Which enzyme complex is responsible for the conversion of Pyruvate to Acetyl CoA?
  3. Q3. The first step of the Krebs cycle involves the condensation of Acetyl CoA with which 4-carbon compound?
  4. Q4. How many molecules of CO2 are released during one complete turn of the Krebs cycle?
  5. Q5. At how many points in the TCA cycle is NAD+ reduced to NADH + H+?
  6. Q6. The conversion of succinyl-CoA to succinic acid is associated with the synthesis of:
  7. Q7. Which enzyme of the Krebs cycle is uniquely located in the inner mitochondrial membrane rather than the matrix?
  8. Q8. FAD is reduced to FADH2 during which specific conversion in the TCA cycle?
  9. Q9. Which intermediate of the Krebs cycle is a 5-carbon compound?
  10. Q10. For every two molecules of Pyruvic acid entering the mitochondria, how many NADH molecules are produced in the Krebs cycle specifically?
  11. Q11. The total number of FADH2 molecules produced from the complete aerobic oxidation of one glucose molecule is:
  12. Q12. What is the net yield of ATP/GTP through substrate-level phosphorylation for every Acetyl CoA that enters the TCA cycle?
  13. Q13. Which of the following is NOT a product of the Krebs cycle?
  14. Q14. Which chemical reaction describes the 'regeneration' step of the Krebs cycle?
  15. Q15. The oxygen required for the 'aerobic' nature of the Krebs cycle is used directly in which step?
  16. Q16. During the conversion of Alpha-ketoglutarate to Succinyl-CoA, which two processes occur simultaneously?
  17. Q17. Which intermediate of the TCA cycle is used as a precursor for the synthesis of chlorophyll and cytochromes?
  18. Q18. If the Krebs cycle is inhibited at the malate dehydrogenase step, which substance will accumulate?
  19. Q19. The total number of CO2 molecules released from one molecule of glucose during the link reaction and the Krebs cycle combined is:
  20. Q20. The Krebs cycle is also referred to as the 'Amphibolic Pathway' because it is involved in: