Porphyrin is found in which of the following?

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(D) Porphyrin is a heterocyclic macrocycle organic compound,composed of four modified pyrrole subunits interconnected at their alpha carbon atoms via

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All of the above

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(D) Porphyrin is a heterocyclic macrocycle organic compound,composed of four modified pyrrole subunits interconnected at their alpha carbon atoms via methine bridges.$1$. Chlorophyll contains a porphyrin ring with a central magnesium $(Mg^{2+})$ ion.$2$. Hemoglobin contains a porphyrin ring (heme) with a central iron $(Fe^{2+})$ ion.$3$. Cytochromes are iron-containing hemoproteins that also possess a porphyrin ring structure.Therefore,all the given options contain porphyrin.

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