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Cytochrome P-450 is not a coloured cell, instead this is a respiratory pigment.

1. Cytochrome P-450 is not a coloured cell.
2. Cytochrome P-450 is a respiratory pigment.
3. Cytochrome P-450 is involved in respiration.
4. Cytochrome P-450 is not involved in photosynthesis.

Correct answer: Cytochrome P-450 is involved in respiration.

Solution

Cytochrome P-450 is associated with respiratory metabolism, so the correct choice is the one stating that it is involved in respiration. The other options either repeat the prompt, are too vague, or mention photosynthesis, which is not the key point here.

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