oxygen binding to hemoglobin has what affect on additional molecule of oxygen binding to the dame molecule of hemoglobin? a. decreases teh binding of more oxygen to that molecule of hemoglobin. b. increases the binding of more oxygen to that molecule of hemoglobin. c. has no effect on the ninding ofm ore oxygen to that molecule of hemoglobin d. this is a trick question becuase only one oxygen can bind to a molecule of hemoglobin

oxygen binding to hemoglobin has what affect on additional molecule of oxygen binding to the dame molecule of hemoglobin? a. decreases teh binding of more oxygen to that molecule of hemoglobin. b. increases the binding of more oxygen to that molecule of hemoglobin. c. has no effect on the ninding ofm ore oxygen to that molecule of hemoglobin d. this is a trick question becuase only one oxygen can bind to a molecule of hemoglobin

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter38: Respiration

Section: Chapter Questions

Problem 2CT

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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.
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.
Which is/are false? a. Carbaminohemoglobin is hemoglobin bound to carbon dioxide b. In the lungs, the oxyhemoglobin saturation curve undergoes a 'left shift' c. At a PO2 of 10 mmHg, there is more deoxyhemoglobin in blood that oxyhemoglobin d. Higher temperatures and lower pH cause hemoglobin to bind more readily with oxygen than in conditions of lower temperatures and higher pH
What is the biological advantage to the sigmoidal binding curve of hemoglobin for oxygen? A. It ensures that hemoglobin has a high affinity for oxygen. B. It allows hemoglobin to bind oxygen irreversibly. C. It ensures that hemoglobin can bind oxygen only weakly. D. It allows hemoglobin to shift between low and high affinities for oxygen.
Why does Fe2+ not fit perfectly into the center hemoglobin's heme pocket, while Fe3+ does ift perfectly into center hemoglobin's heme pocket? A) Fe2+ has a larger effective nuclear charge than Fe3+ . B) Fe2+ is to reactive to stably fit into hemoglobin's heme pocket. C) Fe2+ had a wrinkled shirt D) Fe2+ is repelled by the heme's coordinating nitrogens E) Fe3+ is denser and has a smaller ionic radius than Fe2+
The reason oxygen diffuses into the tissues seen in internal respiration? a. the temperature differences b. the pressure gradient or difference in partial pressure of oxygen in arterial blood and that in a metabolically active tissue c. the larger the partial pressure of the veins d. .the ability of hemoglobin to bind avidly with oxygen
What is the role of the heme prosthetic group in hemoglobin? A. The heme group coordinates the subunits of hemoglobin. B. The heme group binds one molecule of oxygen in the center of the hemoglobin protein. C. The heme group binds a molecule of oxygen for each subunit of hemoglobin. D. The iron atom in the heme group is needed to irreversibly bind oxygen.
How does the concentration of 2,3 BPG affect hemoglobin's P50 for oxygen? select the correct answer A) BPG binds to the N-terminus of Hemoglobin's alpha 2 subunit and increase hemoglobin's P50 for oxygen. B) BPG binds to the heme blocking oxygen's ability to bind and lowering hemoglobin's P 50. C) As the BPG increases hemoglobin's P50 for oxygen increase. D) As the BPG increases hemoglobin's P50 for oxygen decreases. E) BPG does not affect hemoglobin's P50 for oxygen
1. carbon dioxide released during respiration can affect the % oxygen saturation of haemoglobin. Carbon dioxide reacts with water to form carbonic acid. Which statements below explains the effect of carbon dioxide on haemoglobin? A. The release of hydrogen ions causes the pH to rise, which reduces haemoglobin's affinity for oxygen. B. The release of hydrogen ions causes the pH to rise, which increases haemoglobin's affinity for oxygen. C. The release of hydrogen ions causes the pH to fall, which increases haemoglobin's affinity for oxygen. D. The release of hydrogen ions causes the pH to fall, which reduces haemoglobin's affinity for oxygen. E. None of the above can explain the change. 2. The following events occur when carbon dioxide enters an erythrocyte in a capillary. 1. Hydrogencarbonate ions diffuse into the plasma from the red blood cells. 2. Dissociation of carbonic acid 3. Carbon dioxide reacts with water forming carbonic acid 4. Chloride ions…
Some deep diving mammal compress their lungs to remove air. What is FALSE about this situation? A. Some whales have ribs with joints that help the compression. B. Removing air from lungs prevents lethal nitrogen bubbles (the bends). C. The animals store 02 in their blood and muscles during dives D. The air goes from their lungs into tiny spaces within their bones. Which is biggest? A. hemoglobin B. iron C. heme
Which statement describes hemoglobin's cooperativity? A. When tetrameric hemoglobin binds one molecule of O2, its shape changes to make it bind more readily to a second molecule of O2. B. When tetrameric hemoglobin binds one molecule of O2 its shape changes, which prevents binding of any more O2 molecules. C. When oxygen is present in the blood, the shape of hemoglobin changes to allow oxygen to bind to it. D. When the oxygen concentration in blood decreases, then hemoglobin changes its shape to retain oxygen more readily. E. None of the above answer choices correctly describes cooperativity.
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.