Question:
In the ETS, electrons from \(\text{FADH}_{2}\) enter into which complex?
In the ETS, electrons from \(\text{FADH}_{2}\) enter into which complex?
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FADH2 is produced by succinate dehydrogenase, which is itself part of one of the complexes.
Updated On: Nov 12, 2026
- Complex I
- Complex II
- Complex III
- Complex IV
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
NADH gives its electrons to complex I (NADH dehydrogenase).
Step 2: Where FADH2 enters
\(\text{FADH}_2\) is produced by succinate dehydrogenase, which is part of complex II. Its electrons therefore enter the chain at complex II and pass on to ubiquinone.
Step 3: Consequence
Because they bypass complex I, one \(\text{FADH}_2\) yields fewer ATP than one NADH.
Final Answer:
Electrons from FADH2 enter at complex II. \[ \boxed{\text{(B) }\text{Complex II}} \]
NADH gives its electrons to complex I (NADH dehydrogenase).
Step 2: Where FADH2 enters
\(\text{FADH}_2\) is produced by succinate dehydrogenase, which is part of complex II. Its electrons therefore enter the chain at complex II and pass on to ubiquinone.
Step 3: Consequence
Because they bypass complex I, one \(\text{FADH}_2\) yields fewer ATP than one NADH.
Final Answer:
Electrons from FADH2 enter at complex II. \[ \boxed{\text{(B) }\text{Complex II}} \]
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