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Question - Hemoglobin is a tetrameric protein consisting of two α and two βpolypeptide subunits. The structure of the α and β subunits are remarkably similar to that of myoglobin. However, at a number of positions, hydrophilic residues in myoglobin have been replaced by hydrophobic groups in hemoglobin.
a) How can this observation be reconciled with the generalization that hydrophobic residues fold into the interior of proteins?
b) In this regard, what can you say about the nature of the interaction that determine the quaternary structure of hemoglobin?
c) How this tetrameric association make the hemoglobin good for oxygen transport? What effects promote the release of oxygen where it is needed?
the reactant concentration in a zero-order reaction was 6.00times10-2 it m after 185 s and 1.00times10-2 it m after 330
t 50°C the value of KW is 5.5 x 10-14. What are the molarities of hydronium ion and hydroxide ions in a neutral solution at this temperature.
The carbon-14 in a living organism is constant until the organism dies, after which carbon-14 decayss with first order kinetics and a half life of 5730 years. Suppose a bone from an ancient human contains 19.5%of the C-14 found in living organisms..
Constant pressure molar heat capacity of a compound is found to vary with temp, according to molar cp= 15.25 +.138* T--2.21*10^4/T^2 Calculate the enthalpy change when 1 mole of this compound
helium gas at 25 oc filled a balloon to a volume of 2.25 l. what would the volume of this balloon be when cooled at
is alpha-pinene superimposable on its mirror image? moleculesthat are not superimposable on their miror images rotate
a gas mixture being used to stimulate the atmosphere of another planet consists of 323 mg of methane, 165 mg of argon, and 223 mg of nitrogen. The partial pressure of nitrogen at 275 k is 19 kPa.
How many grams of O2 gas would occupy a 400.0 liter container when the temperature is 300.0 K and the pressure is 2.20 atm?
Assuming the gasoline is pure octane (C8H18), how many liters of CO2 at STP will be produced from the combustion of 1.00 liter of gasoline. (assume the density of gasoline is 0.963 g/ mL).
Suppose the conversion of this energy to electricity in a nuclear power plant is 45% efficient, define what mass of uranium-235 undergoes fission in a year in a plant that produces 1000 MW (megawatts). Remind that a watt is 1 J/s.
Ethanol (molar mass = 46 g/mol) can be dehydrated to yield ethene (molar mass = 28 g/mol) by heating it with an excess of concentrated sulfuric acid (acting as a catalyst). CH3CH2OH CH2=CH2 + H2O If 23.3 g of ethanol produced 12.5 g of ethene
Given 867 mL of a buffer solution that is 0.532 M methylamine and 0.86 M methylammonium chloride, calculate the pH of this solution after the addition of 1.14 g sodium hydroxide. The Kb of methylamine is 4.4x10-4
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