The fire emoji next to a friend's name means that you and that special, special person in your life have snapped one another within 24 hours for at least two days in a row. You know, like your friendship is on fire? Or...
In adult humans, the most common hemoglobin type is a tetramer (which contains 4 subunit proteins) called hemoglobin A, consisting of two Î± and two Î² subunits non-covalently bound, each made of 141 and 146 amino acid residues, respectively. This is denoted as Î± 2 Î² 2.
Hemoglobin is a protein that's made of four polypeptide chains. Each of these chains contains a heme group. Therefore, every hemoglobin molecule has the ability to bind four molecules of oxygen. Hemoglobin is the primary protein found in red blood cells, or erythrocytes.Each erythrocyte contains hundreds of thousands of hemoglobin molecules.ach of these chains contains a heme group. Therefore, every hemoglobin molecule has the ability to bind four molecules of oxygen. Hemoglobin is the primary protein found in red blood cells, or erythrocytes. Each erythrocyte contains hundreds of thousands of hemoglobin molecules.