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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?
in bombarding atomic nuclei with proton bullets why must the protons be accelerated to high energies if they are to
It is produced natrually from degradation of organic matter, and also anthropogenically from fuel combustion.) The acid dissociation constant, Ka for formic acid is 10-3.7. Assume T=4*C and I=0.
The observation that a solid is colorless permits you to suggest that a broad category of elements is probably not present in this solid. Explain what is the general name for this category of elements
How old is the skull? (Assume that living organisms have a carbon-14 decay rate of 15.3 dis/min?gC and that carbon-14 has a half-life of 5730 yr.) An ancient skull has a carbon-14 decay rate of 0.80 disintegrations per minute per gram of carbon (0...
What are the pH, pOH, hydroxide ion concentration , and hydronium ion concentration of a 0.014M strontium hydroxide solution
How to convert from 3.56 moles of CH3OH to the number of moles of O2 required?
Mercury metal does not react with hydrochloric acid but it reacts with nitric acid. What is the most probable oxidation state of mercury in solution in its reaction with HNO3
Propose stepwise sythesis of 2-cholor-4-nitrobenzoic acid starting from benzene
If 18mL of oxygen are collected over water at 27 degrees Celcius and 740 mm Hg of pressure, what volume will the dry gas have at STP?(The vapor pressure of water at 27 degrees celcius is 26.7 mm Hg)
The density of aluminum is determined to be 2.680 g/cm3 at 125 degrees celcius. What is the length of one side of a 1 kg cube of aluminum at 640 degrees celcius.
0.65 of hydrogen chloride () is dissolved in water to make 7.5 of solution. What is the of the resulting hydrochloric acid solution
A student plans to titrate 25.00ml of a 0.134M HNO3 solution with a 0.179M NaOH solution. Calculate the volume of NaOH(in ml) that will be needed to reach the equivalence point and anticipated pH.
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