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You are told that the structure of a channel that allows protons to cross the bacterial membrane has 12 amphipathic α -helices.
a. Describe the orientation of these helices with respect to the plane of the membrane. The 12 Helices will be oriented.
b. Describe how both the polar sidechains and the nonpolar sidechains within the helices are arranged within the protein structure.
c. The function of this protein is to move protons through a water-filled cavity between the 12 helices. Which two of the following amino acid side chains would be most likely to line this water-filled channel? (Circle the correct ones). Ser Gln Met Trp
d. If the pH of the cell cytoplasm is 8.0 and the pH of the extracellular medium is 6.5, what do you expect the thermodynamically favorable direction of proton transfer to be?
Which aqueous solution will have the highest total number of moles of ions in the solution. The answer is 100mL 3M calcium nitrate. Why is it not 100mL 4M glucose (C6H12O6), 100mL 1M aluminum fluoride, or 100 mL 2M calcium sulfide. How do you calc..
Problem- What is the molar solubility of AgCl in 0.40 M NH3. Ksp for AgCl is 1.8*10^-10 and Kf for Ag(NH3)2+ is 1.7*10^7.
Water is unique because it is less dense as a solid than as a liquid. How can you account for this unusual attribute
Suppose 1-chlorobutane were halogenated with bromine atoms instead of chlorine atoms. What effect would that have on the relative yields of the four bromochlorobutanes compared to the dichlorobutanes you determined
the following is the better chemical for removing calcium ions from water. Make sure you show the calculations necessary
at equilibrium the flask containing the reacting mixturenis 4 cog --gt nico4gcontains 232 torr co 1240 torr nico4 and
A 20.0-mL sample of 0.800 M HBr solution is titrated with 0.800 M NaOH solution. Calculate the pH of the solution after the following volumes of base have been added.
aluminum and 351 mL of 0.621 M solution of copper (II) chloride, how much of each substance will be present at the end of the reaction. If 10.6 g of the solid is formed, what is the % yield of the reaction?
A 12.0 g sample of solic NH4Cl is heated in a 5.00 L container to a high temperature. At equilibrium, the pressure of NH3 (g) is 1.22 atm. What is the value of Kp for the reaction
The final temperature is 27.06 C. Presume that the volumes are additive, the specific heat of the solution is 4.184 J/g. C and that the density of the solution is 1 g/mL. Compute the enthalpy change, ΔH, in KJ for the reaction.
A 4.305-gram sample of a nonelectrolyte is dissolved in 105 grams of water. The solution freezes at -1.23°C. Calculate the molecular weight of the solute. Kf for water = 1.86°C/m.
What is the pH of a buffer that consists of 0.45 M CH3COOH and 0.35 M CH3COONa? Ka = 1.8 × 10-5
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