Where do you find Cytochromes $b_{6}$ and f ?

Chloroplast

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Lysosomes

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Ribosomes

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Mitochondria

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Solution

The correct option is A Chloroplast
The cytochrome b $_{6}$ f complex (plastoquinolplastocyanin reductase) is an enzyme found in the thylakoid membrane in chloroplasts of plants, cyanobacteria, and green algae, catalyzing the transfer of electrons from plastoquinol to plastocyanin. Thus, option A is correct. The cytochrome b $_{6}$ f is absent in lysosomes, ribosomes and mitochondria. Thus, other options are incorrect.

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b_{6}

Which of the following complexes are involved in photochemical reactions?

(I) Photosystem-I

(II) Photosystem-II

(III) Cytochrome b6/f complex

(IV) ATP synthase

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