1) Our atmosphere is 78% nitrogen and 21% oxygen. If you travel to the top of a
ID: 224759 • Letter: 1
Question
1) Our atmosphere is 78% nitrogen and 21% oxygen. If you travel to the top of a mountain where the total atmospheric pressure is 0.8 atmospheres, what will the partial pressure of oxygen be there? (Give your answers in atmospheres, expressed to the nearest hundredth).
2) If there is a lake at the top of the mountain in question 1, what is the partial pressure of oxygen in the water of the lake? (Assume all molecules are at equilibrium.)
Give your answer in atmospheres, rounded to the nearest hundredth.
3) If the lake water in question 2 has an absorption coefficient for oxygen of 2, approximately how many millimoles of oxygen will dissolve in the water?
4)
a. The oxygen disassociation curve for myoglobin (in red) is skewed to the left of the curve for adult hemoglobin. This means that:
b. Unlike the sigmoid shape of the oxygen disassociation curves for hemoglobin, myoglobin's oxygen disassociation curve is a simpler hyperbolic shape. This difference occurs because:
Answer bank for a & b:
Myoglobin has a lower affinity for oxygen than hemoglobin
Myoglobin has a higher affinity for oxygen than hemoglobin
Each hemoglobin molecule contains more binding sights for oxygen than a myoglobin molecule
A molecule of myoglobin can carry more oxygen than a molecule of hemoglobin
a. The oxygen disassociation curve for myoglobin (in red) is skewed to the left of the curve for adult hemoglobin. This means that:
(Po2) 6,65 100% N 75% 50% 25% 0% T 25! 50 IMb IHbF P50-2 19 27 [mm Hg] 13,3 200 150 100 50 100Explanation / Answer
Answering Q4 (Biology section)
The answerfr both a & b is - Myoglobin has a higher affinity for oxygen than hemoglobin
Explanation-
Oxygen dissociation curves explains the relation between the PO2 and the percentage saturation of O2 carrying molecules
As binding potential increases with each additional O2, hemoglobin displays a sigmoidal curve. This is also called co-operative binding
At low O2 levels percentage saturation will be low, while at high O2 levels molecules will be fully saturated
Myoglobin is an oxygen-binding molecule found in muscles that is made of a single polypeptide with only one heme group
Myoglobin's affinity for oxygen is greater than hemoglobin and becomes saturated at low oxygen concentrations. Myoglobin does not have cooperative binding to oxygen hecne the curve is skewed towards the left.
Under normal conditions (at rest), myoglobin is saturated with oxygen and will store it until O2 levels in the body drop with intense exercise.This allows it to provide oxygen when levels are very low.
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