what-role-do-proximal-and-distal-histidine-residues-play-in-the-heme-prosthetic-

Question

What role do proximal and distal histidine residues play in the heme prosthetic group?

Accepted Answer

They stabilize the iron atom through non-covalent interactions.

Answer

They increase the reactivity of the iron atom.

Answer

They prevent oxygen binding to the iron atom.

Answer

They form covalent bonds with the iron atom.