Which of the Following Statements Is FALSE

Multiple Choice

Which of the following statements is FALSE?

A) Myoglobin is a single polypeptide chain folded about a heme prosthetic group.
B) Hemoglobin is a tetramer, each of which binds a heme group.
C) In both hemoglobin and myoglobin, iron is chelated by a tetrapyrole ring system.
D) The iron in both hemoglobin and myoglobin has two coordination sites that bind to oxygen.
E) Hydrogen bonding to a histidine residue assists stabilization of the Fe2+ -O2 complex in both hemoglobin and myoglobin.