1.Metalloproteins in the blood bind oxygen. Select one: True False 2.The partial
ID: 85305 • Letter: 1
Question
1.Metalloproteins in the blood bind oxygen. Select one:
True False
2.The partial pressure of __________ in dry air at STP is ________. In air being exhaled from giraffe lungs, the partial pressure of this gas would be __________.
Select one:
a. Nitrogen, 0.78 atm, the same
b. Oxygen, 0.21 atm, the same
c. Nitrogen, 0.78 atm, lower
d. Oxygen, 0.78 atm, lower
3.Urea and TMAO are counteracting solutes because_____. Select one:
a. Urea binds to sites on proteins where TMAO would bind, thereby nullifying effects of TMAO
b. Urea increases the volume of free water
c. Urea binds TMAO and prevents it from overly-stabilizing proteins
d. Urea and TMAO effect the structure of bound water molecules in opposite ways
Explanation / Answer
1. True (Explanation: Haemoglobin is an iron containing oxygen transport protein in red blood cells).
2. C (Nitrogen 0.78atm, lower) (Explanation: In giraffe, cooling of exhaled air takes place due to evaporation taking place in large nasal cavity, which makes the exhaled air cooler even more as compared to the outside air. And according to Gay-Lussac's law, temperature and pressure are directly linked to each other,i.e, lower is the temperature, lower will be the pressure.
3. D (Urea and TMAO effect the water structure in opposite ways). (Explanation: Pure water has higher (maximum) hydrogen bonding potential as compared to the the protein-water complex. When TMAO is added to the the protein water complex, it attenuates the strength of H bonds formed between protein groups and water, which leads to the increase in the no. of H bonds per water molecule, stronger water H bonds and long range spatial ordering of the solvent. Therefore, TMAO enhances the water structure. Whereas urea has negligible effect on the H bond structure of water.
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