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In adult humans, hemoglobin is a tetramer, which has two alpha and two beta subunits. The subunits are structurally same and have equal size. Each subunit has a molecular weight of 16,000 and a total molecular weight is about 64,000. Since each subunit of hemoglobin includes a single heme, adult human hemoglobin can hold four oxygen molecules for the total binding capacity. | In adult humans, hemoglobin is a tetramer, which has two alpha and two beta subunits. The subunits are structurally same and have equal size. Each subunit has a molecular weight of 16,000 and a total molecular weight is about 64,000. Since each subunit of hemoglobin includes a single heme, adult human hemoglobin can hold four oxygen molecules for the total binding capacity. | ||
[[File:Heme.png|right|250px|thumb|Heme.]] | |||
Stepwise Reaction: | Stepwise Reaction: |