2, 3 DPG binds to __________ site of Hb and __________ release of O2?
**Core Concept**
The question is testing the understanding of the binding of 2,3-Bisphosphoglycerate (2,3-DPG) to hemoglobin (Hb) and its effect on oxygen release. 2,3-DPG is a byproduct of glycolysis in red blood cells.
**Why the Correct Answer is Right**
2,3-DPG binds to the beta chains of deoxyhemoglobin, stabilizing the deoxygenated form and facilitating the release of oxygen. This binding reduces the oxygen affinity of hemoglobin, making it easier for oxygen to be released to tissues.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not specify the correct site of binding or the effect on oxygen release.
**Option B:** Incorrect as it inaccurately describes the binding site and effect.
**Option C:** Incorrect because it inaccurately describes the relationship between 2,3-DPG binding and oxygen release.
**Clinical Pearl / High-Yield Fact**
2,3-DPG levels increase in response to hypoxia, helping to improve oxygen delivery to tissues by reducing hemoglobin's affinity for oxygen. This is a key adaptation mechanism.
**Correct Answer:** D. deoxy site of Hb and increases release of O2