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Which atoms are present in the porphyrin of a chlorophyll molecule?

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Which atoms are present in the porphyrin of a chlorophyll molecule?

(a) iron

(b) magnesium

(c) calcium

(d) sulphur

I have been asked this question in class test.

My enquiry is from Chloroplast Structure and Function in division Chloroplast Structure and Function of Cell Biology

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The correct option is (b) magnesium

To explain I would say: In myoglobin and hemoglobin the porphyrins contain iron (heme groups) whereas porphyrins present in chlorophyll contain magnesium atom.

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