Question:
Rieske centre is
Rieske centre is
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The Rieske iron-sulfur protein is found in:
- The Cytochrome \(b_6f\) complex of chloroplasts (photosynthesis).
- The Cytochrome \(bc_1\) complex (Complex III) of mitochondria (respiration).
- The Cytochrome \(b_6f\) complex of chloroplasts (photosynthesis).
- The Cytochrome \(bc_1\) complex (Complex III) of mitochondria (respiration).
Updated On: Jul 6, 2026
- Core complex I
- Cytochrome b6-f complex
- D1 protein
- D2 protein
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The Rieske iron-sulfur protein (Rieske Fe-S) is an essential component of biological electron transport chains.
It is characterized by containing an [2Fe-2S] cluster coordinated by two cysteine and two histidine amino acid residues.
Step 3: Detailed Explanation:
In plants, the light reactions of photosynthesis involve the transfer of electrons through several membrane complexes in the thylakoid.
The Cytochrome \(b_6f\) complex acts as an intermediary that transfers electrons from Photosystem II (via plastoquinone) to Photosystem I (via plastocyanin).
The Rieske iron-sulfur center is an integral subunit of this Cytochrome \(b_6f\) complex and participates directly in the Q-cycle mechanism.
The D1 and D2 proteins are core subunits of the Photosystem II reaction center, not Cytochrome \(b_6f\).
Step 4: Final Answer:
The Rieske centre is a part of the Cytochrome b6-f complex, making option (B) the correct choice.
The Rieske iron-sulfur protein (Rieske Fe-S) is an essential component of biological electron transport chains.
It is characterized by containing an [2Fe-2S] cluster coordinated by two cysteine and two histidine amino acid residues.
Step 3: Detailed Explanation:
In plants, the light reactions of photosynthesis involve the transfer of electrons through several membrane complexes in the thylakoid.
The Cytochrome \(b_6f\) complex acts as an intermediary that transfers electrons from Photosystem II (via plastoquinone) to Photosystem I (via plastocyanin).
The Rieske iron-sulfur center is an integral subunit of this Cytochrome \(b_6f\) complex and participates directly in the Q-cycle mechanism.
The D1 and D2 proteins are core subunits of the Photosystem II reaction center, not Cytochrome \(b_6f\).
Step 4: Final Answer:
The Rieske centre is a part of the Cytochrome b6-f complex, making option (B) the correct choice.
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