MCQ on Q Cycle




The Q cycle is a mechanism in the electron transport chain’s complex III (cytochrome bc1 complex) that transfers electrons from ubiquinol (QH2) to cytochrome c. It involves proton pumping from the mitochondrial matrix to the intermembrane space, contributing to the proton gradient for ATP synthesis. This is an MCQ on Q Cycle and its Significance in Electron Transport System in Mitochondria and Chloroplast.

1. 
What is the Q cycle primarily associated with?

2. 
Which complex of the electron transport chain involves the Q cycle?

3. 
What is the main function of the Q cycle in the electron transport chain?

4. 
Which mobile electron carrier is directly involved in the Q cycle?

5. 
In the Q cycle, ubiquinone (Q) is reduced to which form?

6. 
How many electrons does ubiquinol (QH2) donate in one complete Q cycle?

7. 
Which component of Complex III receives electrons from ubiquinol (QH2)?

8. 
During the Q cycle, how many protons are translocated across the inner mitochondrial membrane per molecule of ubiquinol (QH2) oxidized?

9. 
What is the fate of the electrons transferred from Complex III to cytochrome c?

10. 
What is the importance of the Q cycle in cellular respiration?



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mcq on q cycle

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