Multiple choice

The porphyrin ring of a heme group consists of central atom of

  1. magnesium

  2. iron

  3. copper

  4. nitrogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The heme group is a prosthetic group containing a porphyrin ring with a central iron atom (Fe2+). This iron is crucial for oxygen binding in hemoglobin and myoglobin, and for electron transfer in cytochromes.

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