The association of O₂ with deoxy-myoglobin A) causes a 60 degree rotation of the porphyrin ring. B) is accompanied by the dissociation of 2,3-bisphosphoglycerate. C) leads to the reduction of the heme Fe ³⁺to Fe ²⁺. D) pulls the iron ion into the plane of the porphyrin ring. E) replaces the distal histidine residue in the iron coordination system.

Question

Quizplus · Accepted Answer

The association of O₂ with deoxy-myoglobin pulls the iron ion into the plane of the porphyrin ring. This is because the O₂ ligand coordinates with the iron ion in the heme, causing a distortion of the porphyrin ring and creating a planar heme group.

The Association of O2 with Deoxy-Myoglobin

The Association of O₂ with Deoxy-Myoglobin