Question

Question #b5049

Answer 1

Heme is a heterocyclic structure that contains a pocket where Iron atoms can fit in.

Explanation:

When looking at the structure of Heme in general

You will see that the nitrogen groups in the middle form a polar pocket. That pocket is where the Iron cation fits in to form covalent bonds with the nitrogen groups as shown in the next picture.

Further Illustrations:

I hope that answers your question.

Further Reading:
Heme