Tests Bank For a Manual of Laboratory and Diagnost
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Back to course (/en-us/courseware/page/wgu_C785_30Sep19_biochemistry_1/wbp_unit_5_quiz_1)
UNIT 5 QUIZ
ADDITIONAL PRACTICE QUESTIONS QUIZ - UNIT 5
Step 3 of 3
LEARNING OBJECTIVE
Given a scenario regarding hemoglobin, the student explains how pH
influences its function.
Question 19 of 26
Does oxygenated hemoglobin have a high or low affinity for carbon monoxide
(CO)?
Low affinity for CO
High affinity for CO
Correct! Carbon monoxide (CO), which is similar in shape to oxygen
(O2), binds to the iron (Fe) atom in the heme group when hemoglobin
is in the R state and the heme group is planar, just like oxygen does.
Hemoglobin binds to carbon monoxide with 200 times the affinity of
oxygen, which means it is very difficult to get rid of the carbon
monoxide once it is bound to hemoglobin.
Question 20 of 26
This study source was downloaded by 100000885637655 from CourseHero.com on 07-04-2024 00:07:38 GMT -05:00
, What happens to oxygenated hemoglobin as the amount of CO2 increases?
pH increases, Hb shifts more to the T state, oxygen affinity
decreases
pH decreases, Hb shifts more to the R state, oxygen affinity
increases
pH increases, Hb shifts more to the R state, oxygen affinity
increases
pH decreases, Hb shifts more to the T state, oxygen affinity
decreases
Correct! The pH decreases as CO2 increases, when the CO2 combines
with water to form H+ and bicarbonate, and decreasing pH favors the
T state and low affinity.
Question 21 of 26
This study source was downloaded by 100000885637655 from CourseHero.com on 07-04-2024 00:07:38 GMT -05:00
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