The first thing that happens when O2 binds to Hemoglobin (Hb) is that: a Hb shifts to the Relaxed state. b Tension on Heme causes a hydrogen bond to break. c The pH of the bloodstream increases. d BPG binding increases.
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The first thing that happens when O2 binds to Hemoglobin (Hb) is that:
| a |
Hb shifts to the Relaxed state. |
|
| b |
Tension on Heme causes a hydrogen bond to break. |
|
| c |
The pH of the bloodstream increases. |
|
| d |
BPG binding increases. |
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- Which occurs when a hemoglobin molecule binds oxygen in the lungs? a The first O2 molecule binds more easily than the last O2 molecule. b Each heme group can reversibly bind four O2 molecules simultaneously. c Salt bridges between subunits break as the first O2 binds. d Cooperative binding of O2 causes the four subunits to dissociate e An iron atom is removed from a porphyrin group.With the Bohr effect, more oxygen is released because a(n)____. a) increase in pH(alkalosis) strengthens the hemoglobin-oxygen bond b) increase in pH(alkalosis) weakens the hemoglobin-oxygen bond c) decrease in pH (acidosis) weakens the hemoglobin-oxygen bond d) decrease in pH (acidosis) strengthens the hemoglobin-oxygen bond. Nicotine, one of the components of cigarettes, slows cilia" lining the respiratory tract, causes blood vessels to constrict, and increases heart rate. Another component of cigarette smoke is carbon monoxide. As you have read, carbon monoxide competes with oxygen for binding sites on the hemoglobin molecule found in red blood cells. Analyse the data presented, and describe the potential dangers associated with smoking.
- Which of the following is true about the proximal histidine of hemoglobin? A. It forms a hydrogen bond with bound oxygen. B. It is bonded to the Fe2+ atom coordinated by heme C. It binds oxygen D. It is not consumed in myoglobinWhich of the following steps does not occur when the first oxygen molecule binds to HB? a) Heme flattens out b) DPG eventually gets released c) Salt bridges are broken d) Valine 98 forms H-bond with Tyrosine 145Which of the following stabilize the hemoglobin quaternary structure of low-affinity to oxygen molecules? Group of answer choices a. CO b. CO2 c. bisphosphoglycerate d. H+
- You are studying with a friend who is describing the Bohr effect. She tells you that in the lungs, hemoglobin binds oxygen and releases hydrogen ion; as a result, the pH increases. She goes on to say that in actively metabolizing muscle tissue, hemoglobin releases oxygen and binds hydrogen ion and, as a result, the pH decreases. Do you agree with her reasoning? Why or why not?The majority of oxygen in the blood is transported by ________. a. dissolution in the blood b. being carried as bicarbonate ions c. binding to blood plasma d. binding to hemoglobinOxygen in our blood is transported by a protein named: A. haemoglobin B. keratin C. collagen D. myoglobin
- 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.What is that component of cigarettes that will compete in binding of RBC hemoglobin-and-Oxygen complex, that consequently is disturbing human oxygenation--- when you will smoke or inhale it? a. tar b. nicotine c. carbon monoxide d. carbon dioxide *Choose only one answerCarbon dioxide when traveling in the form of bicarbonate ion does so ______ a. bonded to water b. associated to hemoglobin c. within the plasma of blood d. within the red blood cell
