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Cytochrome is an iron-containing porphyrin pigment. These are electron transferring proteins often regarded as enzymes.

1. Cytochrome is an iron-containing pigment.
2. Cytochrome transfers electrons.
3. Cytochrome is regarded as an enzyme.
4. Cytochrome is a porphyrin pigment.

Correct answer: Cytochrome transfers electrons.

Solution

The statement says cytochromes are electron-transferring proteins, which directly matches the idea that they transfer electrons. The other options mention properties of cytochromes, but only one states their key function.

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