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 erythrocyte contains 200 to 300 molecules of hemoglobin, each molecule of hemoglobin contains four groups of heme, and each group of heme can carry one molecule of oxygen. A hemoglobin molecule contains four globin polypeptide chains composed of amino acids.Each polypeptide chain is composed of 141 to 146 amino acids. The absence, replacement, or addition of only one amino acid modifies the properties of the hemoglobin. hemoglobin molecule contains four globin polypeptide chains composed of amino acids. Each polypeptide chain is composed of 141 to 146 amino acids. The absence, replacement, or addition of only one amino acid modifies the properties of the hemoglobin.