The US is considered a terrorist regime outside the United States. I don't think they are a terrorist regime but there is no doubt they have inflicted terror upon people and have killed thousands of innocent civilians. Source(s): aliasasim Â· 9 years ago.
Hemoglobin consists of four subunits, each with a cofactor called a heme group that has an iron atom center. The iron is the main component that actually binds to oxygen, thus each hemoglobin molecule is able to carry four molecules of O 2.
Each hemoglobin molecule contains four heme groups. Hemoglobin consists of two alpha chains and two beta chains. Heme groups contain the mineral iron. Most of the hemoglobin in red blood cells is in the form of carbaminohemoglobin.