2,3 Bisphosphoglycerate: a) binds to the central cavity of the fully deoxygenated hemoglobin protein in order to stabilize the deoxygenated form of the protein in respiring tissues. b) binds to the central cavity of the fully oxygenated hemoglobin protein in order to stabilize the oxygenated form of the protein in the lungs. c) competes with O2 for heme binding and as a result shifts the oxygen saturation curve towards the deoxygenated form. d) binds to each hemoglobin subunit and as a result shifts the oxygen saturation curve towards the deoxygenated form. This phenomenon is known as the Bohr Effect.
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What is the actual, significant effect of 2,3-bisphosphoglycerate on oxygen binding by hemoglobin? Select one: a. Kd for oxygen increases in peripheral tissues b. A higher concentration of oxygen can bind at high altitudes compared to low altitudes c. The affinity of hemoglobin for oxygen in peripheral tissues increases at high altitudes d. Heme further decreases affinity for both CO2 and H+ in lungs, allowing more O2 to bind. e. It has no effect on O2 affinity, but it forces heme into the R-state.
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Which statement is NOT correct concerning 2,3-bisphosphoglycerate (BPG)? Select one: a. It binds at a distance from the heme groups of hemoglobin. b. It binds with lower affinity to fetal hemoglobin than to adult hemoglobin. c. It increases the affinity of hemoglobin for oxygen. d. It is an allosteric modulator. e. It is normally found associated with the hemoglobin extracted from red blood cells. Myoglobin Select one: a. is an auxiliary system for oxygen transport in the blood b. would be ineffective in delivering oxygen to tissues c. shows the Bohr Effect d. would be ineffective in binding oxygen at high pO2 environments. __________ contains more salt bridges and is therefore more constrained than __________. Select one: a. oxyhemoglobin, deoxyhemoglobin b. trypsin, chymotrypsin c. deoxyhemoglobin, oxyhemoglobin d. insulin, proinsulin
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