Is Hgb a carbohydrate, fat, protein, or nucleic acid?
What is its quarternary structure?
Name all the components in 1 molecule of Hgb.
Where does O2 bind? How many O2s can 1 molecule of Hgb carry?
Where does CO2 bind to Hgb?
Hemoglobin is made up of a protein called globin - that is made up of 4 polypeptide chains (2 identical alpha chains and 2 identical beta chains). A nonprotein pigment, called a heme, is attached to each of the 4 chains. An iron ion is attached to each of the four hemes.
1 globin in 4 chains, 4 hemes, and 4 iron ions
Oxygen binds to each iron ion in the heme so each molecule of Hgb can carry 4 O2 molecules.
CO2 can combine with the amino acids on the globin to be carried back to the lungs to be exhaled