MCQ practice · SSC Biology Board questions · Chapter 4: Bioenergetics
How many molecules of CO2 are produced in all in the Krebs cycle?
Think it through first, then pick an option.
- a 8
- b 6
- c 4
- d 2
Answer and explanation
Correct answer: c 4
One glucose gives 2 acetyl Co-A, each giving 2 CO2 in the Krebs cycle; 4 molecules in all.
Why the other options are wrong
- a 8: 8 molecules of CO2 are for the Krebs cycle of two glucose molecules.
- b 6: 6 CO2 is the total of all stages for one glucose, not of the Krebs cycle alone.
- d 2: 2 CO2 is for one acetyl Co-A; one glucose gives two.
Your account is open, so all 30,000+ MCQs from every chapter are yours. Start practising SSC Biology →
Want to keep going?
A free account carries you on to the next questions and opens 30,000+ MCQs from every chapter. Join before launch and Chirkut bundles are 60% off.
The ones you missed, worth one more look