Which of the following concerning hemoglobin is true? a) BPG decreases at high altitudes and causes more O2 offloading in tissues b) As pH increases, [CO2] increases in tissues, causing more O2 release in tissue c) The R state is stabilized by CO2 binding, whereas the T state is stabilized by O2 binding d) About 38% of oxygen dissociates from hemoglobin in tissues e) Hemoglobin has a higher affinity for oxygen than carbon monoxide My guess is D.

Which of the following concerning hemoglobin is true? a) BPG decreases at high altitudes and causes more O2 offloading in tissues b) As pH increases, [CO2] increases in tissues, causing more O2 release in tissue c) The R state is stabilized by CO2 binding, whereas the T state is stabilized by O2 binding d) About 38% of oxygen dissociates from hemoglobin in tissues e) Hemoglobin has a higher affinity for oxygen than carbon monoxide My guess is D.

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter10: The Respiratory System

Section: Chapter Questions

Problem 4RQ: What is oxyhemoglobin? Where does it form?

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Which of the following concerning hemoglobin is true? a) BPG decreases at high altitudes and causes more O2 offloading in tissues b) As pH increases, [CO2] increases in tissues, causing more O2 release in tissue c) The R state is stabilized by CO2 binding, whereas the T state is stabilized by O2 binding d) About 38% of oxygen dissociates from hemoglobin in tissues e) Hemoglobin has a higher affinity for oxygen than carbon monoxide My guess is D. What following statement is TRUE concerning motifs and domains? a) Both motifs and domains are independently stable. b) Domains undergo dynamic individual changes that affect the entire protein c) B-a-ß loops, B barrels, and helix-turn-helix structure are types of domains d) Motifs and domains are part of secondary structural elements e) Ab initio computations predict motif folds accurately a majority of the time My guess is B. Which of the following is TRUE under the following conditions: an enzyme displaying Michaelis-Menten kinetics…
Which of the following does not happen at the O₂ binding site of hemoglobin (Hb)? 1) Movement of the metal co-factor II) Protonation of the proximal His III) The spin state change of the Fe2+ ion IV) Change of shape of the protoporphyrin IX ring OI ON O III Oll
The sigmoidal, cooperative binding curve commonly observed for hemoglobin is a result of: a) competition between CO2 and O2 for heme binding. B) competition between heme and distal His for O2 binding c) competition between BPG and CO2 for binding at the central cavity site d) T to R transition Hemoglobin has a tendency to release its oxygen to the tissues because: a) in this region pH is high and O2 concentrations are low b) in this region both pH and O2 concentrations are low c) in this region both pH and O2 concentrations are high d) there is much BPG in this region Which statement about fetal hemoglobin is not true? A) fetal hemoglobin has gamma chains instead of beta chains b) fetal hemoglobin binds BPG less strongly than maternal hemoglobin c) fetal hemoglobin binds oxygen less strongly than maternal hemoglobin d) fetal hemoglobin binds oxygen more strongly than maternal hemoglobin Which process is most responsible for the sickling of cells seen in sickle…
Which of the following statements are TRUE: Very low oxygen levels will cause: a) Myoglobin instead of hemeglobin will be used to transfer oxygen to cells b) You might experience feelings similar to sickle-cell anemia c) You might have a higher total concentration of hemeglobin to help transport enough oxygen. d) Oxygen will be more concentrated in the air, resulting in higher saturation of hemeglobin
Which of the following statements is FALSE regarding a rightward shift in the hemoglobin-oxygen dissociation curve? A) Affinity for oxygen is increased. B) Oxygen loading onto the hemoglobin is increased. C) Hemoglobin is more saturated at a given PO2. D) It can be caused by a decrease in temperature. E) It can be caused by a decrease in blood pH.
Which of the following statements is FALSE regarding a leftward shift in the hemoglobin-oxygen dissociation curve? A) Affinity for oxygen is increased. B) Oxygen loading onto the hemoglobin is increased. C) Hemoglobin is more saturated at a given PO2. D) It can be caused by a decrease in temperature. E) It can be caused by a decrease in blood pH.
Which of the following can affect the binding of oxygen to hemoglobin? A) The pH of plasma OB) The levels of 2,3-bisphosphoglycerate C) Albumin levels in plasma D) a and b E) a and c OF) a, b and c
The ability of hemoglobin to deliver oxygen is enhanced because: A) The partial pressure of oxygen is lower in most tissues than it is in the lungs OB) The metabolic activity in most tissues lowers the pH of the blood C) The metabolic activity of tissues increases carbon dioxide levels D) All of the above E) b and c only
Choose the factors that favor LOADING of oxygen onto hemoglobin. a) higher PO b) higher pH c) lower PCO d) lower BPG e) all of the above
Most of the oxygen transported in blood is A) Attached to the plasma membrane of red blood cells B) Bound to the globin portion of hemoglobin C) Bound to the heme portion of hemoglobin D) Dissolved in the cytoplasm of red blood cells
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Carbon monoxide (CO) is toxic to humans because it: A) is rapidly converted to toxic CO2. B) binds to the globin portion of hemoglobin and prevents the binding of O2. C) binds to myoglobin and causes it to denature. D) binds to the heme portion of hemoglobin and causes heme to unbind from hemoglobin. E) binds to the Fe in hemoglobin and prevents the binding of O2.