what-is-the-significance-of-the-tetrapyrrole-ring-system-in-the-heme-prosthetic-

Question

What is the significance of the tetrapyrrole ring system in the heme prosthetic group?

Accepted Answer

It provides a planar structure for iron binding.

Answer

It prevents iron binding.

Answer

It provides a spherical structure for iron binding.

Answer

It increases the reactivity of the iron atom.