369Exam1v1_S13(1) - Copy

The bohr effect on hemoglobin is a the increase in

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55. The Bohr effect on hemoglobin is A) the increase in oxygen affinity in the presence of carbon dioxide B) the decrease in oxygen affinity in the presence of 3-bisphophoglycerate C) the decrease in oxygen affinity in the presence of protons D) the increase in oxygen affinity in the presence of carbon monoxide 56. Which of the following conditions causes hemoglobin to release oxygen more readily? 57. A segment of the coding strand of a gene is shown below. 1) What is the sequence of the complementary strand synthesized by DNA polymerase? 2) What is the sequence of the mRNA synthesized by RNA polymerase? 5'-ACACCATGGTGCATCTGACT-3' Section III (18 points): 3 points each 58. The oxygen-binding curves for normal hemoglobin (Hb A) and a mutant hemoglobin (Hb Great Lakes) are shown in the figure below. Which of the two hemoglobins: 1) has a higher affinity for oxygen when p O 2 = 20 torr; and 2) is most efficient at delivering oxygen from arterial blood ( p O 2 = 75 torr) to active muscle ( p O 2 = 20 torr)? 59. Which one of the three structures below would not exist at ANY pH? A) B) C) Version 1 Page 7
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Use the following to answer question 60: While most human beings are able to hold their breath for only a minute or two, other species are able to stay under water for much longer periods of time. For example deep sea-diving mammals, such as whales and seals, are able to stay under water for long periods of time because their muscles contain many-fold higher concentrations of myoglobin than humans. Crocodiles are also able to stay submerged for periods of time exceeding one hour, which allows the crocodile to kill small animals by drowning them. However, the crocodile does not have large amounts of myoglobin in its muscle, as the deep sea-diving mammals do. In 1995, Nagai and colleagues suggested that bicarbonate (HCO 3 - ) binds to hemoglobin to promote the dissociation of oxygen.
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