alleryStart learning →What is the composition of one hemoglobin molecule?
ATwo globin chains, each bound to two hemes
BFour heme groups bound to a single globin
CFour globin chains around one iron atom
DFour globin chains, each bound to one heme
Answer & Solution
Correct answer: D. Four globin chains, each bound to one heme
1. Hemoglobin consists of four folded globin chains, designated alpha 1 and 2 and beta 1 and 2.
2. Each of those globin chains is bound to one heme, the red pigment molecule.
3. Each heme contains one iron ion, so there are four iron ions per hemoglobin.
4. The option putting a single iron atom at the centre halves and then quarters the true count, which is why it cannot support four bound oxygen molecules.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.3 Erythrocytes_
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