If the central Mg atom is replaced by Fe, the chlorophyll becomes:
A
Catalase
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B
Phytochrome
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C
Cytochrome
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D
None of the above
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Solution
The correct option is C Cytochrome Cytochromes are proteins to which one to two tetrapyrrole rings are bound. These tetrapyrroles are very similar to the chromophores of chlorophylls.
However, chlorophylls contain Mg++ as the central atom in the tetrapyrrole, whereas the cytochromes have an iron atom.
Cytochromes play an important role in photosynthesis (photophosphorylation) and respiration both.