Adult hemoglobin is composed of which subunits?

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Prepare for the PLTW Biomedical Science Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

Adult hemoglobin is composed of which subunits?

Explanation:
Hemoglobin in adults is a tetramer, built from four protein subunits. The common adult form consists of two alpha chains and two beta chains (α2β2), with each chain binding a heme group to carry oxygen. This arrangement is what allows hemoglobin to pick up oxygen in the lungs and release it in tissues throughout the body. A fetal form uses two alpha and two gamma chains (α2γ2), which gives it a higher affinity for oxygen, and after birth the beta chains replace the gamma chains as development shifts to the adult form. So the adult subunit composition is two alpha and two beta.

Hemoglobin in adults is a tetramer, built from four protein subunits. The common adult form consists of two alpha chains and two beta chains (α2β2), with each chain binding a heme group to carry oxygen. This arrangement is what allows hemoglobin to pick up oxygen in the lungs and release it in tissues throughout the body. A fetal form uses two alpha and two gamma chains (α2γ2), which gives it a higher affinity for oxygen, and after birth the beta chains replace the gamma chains as development shifts to the adult form. So the adult subunit composition is two alpha and two beta.

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