Question:
Given below are two statements:
Statement I: Ubiquinone is a lipid-soluble mobile electron carrier commonly referred to as "Coenzyme Q".
Statement II: Ubiquinone acts as an electron sink which links transfer of electrons from both NADH and FADH2 to the next complex in the Electron Transport Chain.
In the light of the above statements, choose the most appropriate answer from the options given below:
Given below are two statements:
Statement I: Ubiquinone is a lipid-soluble mobile electron carrier commonly referred to as "Coenzyme Q".
Statement II: Ubiquinone acts as an electron sink which links transfer of electrons from both NADH and FADH2 to the next complex in the Electron Transport Chain.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement I: Ubiquinone is a lipid-soluble mobile electron carrier commonly referred to as "Coenzyme Q".
Statement II: Ubiquinone acts as an electron sink which links transfer of electrons from both NADH and FADH2 to the next complex in the Electron Transport Chain.
In the light of the above statements, choose the most appropriate answer from the options given below:
Show Hint
Ubiquinone (Coenzyme Q):
- Lipid-soluble.
- Accepts electrons from NADH and FADH2.
- Links Complex I/II to Complex III.
- Lipid-soluble.
- Accepts electrons from NADH and FADH2.
- Links Complex I/II to Complex III.
Updated On: Sep 1, 2026
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
Show Solution
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of the electron transport chain components.
Step 2: Detailed Explanation:
Ubiquinone is a lipid-soluble mobile electron carrier.
It is commonly referred to as Coenzyme Q (CoQ10).
This statement is true.
Ubiquinone accepts electrons from:
- NADH (via Complex I).
- FADH2 (via Complex II).
It then transfers electrons to Complex III.
It acts as an electron sink, linking the two entry points.
This statement is true.
Thus, both statements are correct.
Step 3: Final Answer:
Thus, both statements are correct, which corresponds to option (A).
[0.5cm]
This question tests knowledge of the electron transport chain components.
Step 2: Detailed Explanation:
Ubiquinone is a lipid-soluble mobile electron carrier.
It is commonly referred to as Coenzyme Q (CoQ10).
This statement is true.
Ubiquinone accepts electrons from:
- NADH (via Complex I).
- FADH2 (via Complex II).
It then transfers electrons to Complex III.
It acts as an electron sink, linking the two entry points.
This statement is true.
Thus, both statements are correct.
Step 3: Final Answer:
Thus, both statements are correct, which corresponds to option (A).
[0.5cm]
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