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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?
Acid rain with a pH as low as 1.5 has been recorded in West Virginia. What is the H3O+ concentration in this acid rain and how many grams of HNO3 must be dissolved to make 25L of solution that has a pH of 1.5
A gas sample containing N2 and O2 was found to contain 72% N2. If the pressure of the sample was 2.0 atm, what is the partial pressure of O2?
The problem gives you- 1-bromo-1-methylcyclohexane and the product is cyclohexanone You have to use two reagents or mechanisms and show an intermediate
Which of the following is correct regarding an acid-base conjugate pair. a. The conjugate base will have one less proton and one less negative charge. b. The conjugate acid will have one more proton and one less positive charge.
What is the difference in entropy between ethanol's liquid and gaseous states at 351.44 K? What I'm asking is what is the size of the "jump" on the Sm versus Temperature curve.
The liquid is allowed to stand in contact with the solid until equilibrium is achieved and then the liquid is poured off. What is the mass of solid remaining?
Draw three resonance structures for N2O (nitrous oxide) and identify the most "important" resonance structure.
For the reaction 2HCl+Na2CO3 →2NaCl+H2O+CO2 what volume of 0.45 M HCl solution would be needed to produce 2.5 L of CO2 at STP?
Problem- Consider a binary system made up of benzene and toluen .it contains 50% of benzene and 50% of toluen at temperature 100C. Calculate the equilibrium composition of benzene and toluen in vapor phase and total pressure at these conditions
a 0.5078g sample of impure nitrobenzene was treated with 1.044g of tin. when the reaction was complete the residual tin
How are the princible of Le chatelier's used to increase the percentage yield in the production of ammonia in the haber process?
19mg of 9-fluorenone is dissolved in 5ml of diethyl ether. the resulting organic solution is extracted with 10ml of
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