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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.
3 a. Describe the orientation of these helices with respect to the plane of the membrane. (1 sentence)
The 12 Helices will be oriented
3 b. Describe how both the polar sidechains and the nonpolar sidechains within the helices are arranged within the protein structure. (2 sentences or less)
3 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
3 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?
Find the temperature and the pressure of a gas inside the cylinder - what was the initial pressure of the gas in the cylinder?
Presume the solution has the same specific heat as water 4.184 J/(g•°C) as well as that there's negligible heat loss to the surroundings. Explain how much heat was absorbed by the solution. Explain what is the enthalpy of the reaction
The activation energy for a particular reaction is Ea=14.20kj. Explain what percentages of the molecules are at the or above the activation energy at 500.0k
calculate the amount of heat required to completely sublime 34.0g of solid dry ice at its sublimation temperature. the
Start Virtual ChemLab and select Alpha and Beta Particles from the list of assignments. The lab will open in the Quantum laboratory. What source is used in this experiment? Drag your cursor over the source to identify it.
Describe the difference between the following and list any particular advantage possessed by one over the other a)hydrogen and deuterium discharge lamps as sources for ultraviolet radiation
when carbon is burned in the presence on oxygen the carbon and oxygen combine to produce carbon dioxide. if you start
Which electrode gains mass and which loses mass as the cell reaction proceeds? What is the equation for the equation for the overall cell reaction?
Limesonte is another form of CaCO3. Sandstone is primarily silica or sand, SiO2. On the basis of observations made in today's experiment, explain a test that would allow you to distinguish between limestone and sandstone.
Consider: C7H16 (l) + 11 O2 (g) → 7 CO2 (g) + 8 H2O (l) ΔH°reaction=- 4130 kJ. How much energy is released when 4.000 moles of C7H16, is combusted?
Calcium Hydroxide is a strong electrolyte. Determine the concentration of each of the individual ions in a 0.30 M Ca (OH)2 aq solution.
Calculate the number of grams of solute that would be needed to make each of the following solutions
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