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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?
ammonia can be decomposed to give 3 parts by mass of hydrogen and 14 parts by mass of nitrogen. what mass of nitrogen
Determine the enthalpy for this reaction: \rm 2NaOH (s)+ CO_2 (g) \rightarrow Na_2CO_3 (s) + 2H_2O (l) Express your answer in kilojoules per mole to four significant figures.
One of the chair conformations of cis-1,3-dichlorocyclohexane is more stable than the other by 25.0 kJ/mol. Use this to estimate the energy cost of a 1,3-diaxial interaction between two chlorine atoms. Be sure to specify units.
What is the molarity (mol/L) of a potassium permanganate solution if 14.09 mL of it was used to titrate a 10.00 mL sample
Assuming that the total pressure of the gases is 1.52 and that their mole ratio is 94 : 4.0 : 1.5 : 0.50, calculate the partial pressure (in atmospheres) of each gas.
If the CO2 and O2 in the above reaction are measured at the same temperature and pressure, 1. How many milliliters of O2 are produced per minute. At what rate is the Na2O2 consumed, in grams per hour
Does the type of fat used to make soap result in soap with different properties. What is the best choice of fat to use and why
For 0.51 M HCN (Ka=6.2 x 10-10), mark the majorand minor species found in the solution. H+ HCN CN- H2O OH- Now calculate the pH of 0.51 M HCN solution. (Ka=6.2 x 10^-10)
Suppose that a fully charged lead-acid battery contains 1.50L of 5.00M H2SO4. What will be the concentration of H2SO4 in the battery after 3.40A of current is drawn from the battery for 4.50 hours?
50mL of 0.1M aqueous solution of some organic compound was brought in contact with 7mL of octanol at 20oC. After equilibration GC analysis of octanol phase shows component concentration of 0.4M. Explain what is the portioning coefficient of this c..
Problem- The equation of line determined from a Beer's Law plot is y = 0.195x + 0.4. What is the resistance of an unknown water sample if the assumed concentration is 1.8ppm
Predict the mass of the most abundant fragment signal in the mass spectrum of 2,2-dimethylpentane. 85 amu 29
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