AP Biologymediummcq1 pt
Hemoglobin's ability to carry oxygen depends on which structural feature?
A.Four subunits assembled into quaternary structure
B.A single polypeptide chain only
C.Its carbohydrate side chains
D.A lipid bilayer core
Explanation
Core Concept
Hemoglobin is a tetramer of two α and two β globin chains, each with a heme group. Quaternary assembly enables cooperative oxygen binding.
Correct Answer
AFour subunits assembled into quaternary structure
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