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Cell membranes are now known to be organized into double monolayers or "bilayers" of molecules with nonpolar tails and polar heads. Researchers in 1925 first demonstrated the existence of the bilayer in the cell membrane by disrupting the cell membranes from a known number of cells. The lipids from the broken cell membranes covered a water surface with about twice the area of the cell membranes themselves. Suppose all of the cell membranes in a sample of cells were disrupted and added dropwise to water in a Petri dish until a monolayer formed. Estimate the average area of a cell in square micrometers, and the diameter of a single cell in micrometers, using the data below. Assume the cells are roughly spherical. What is the average cell surface area
Calculate the mass of potassium hydrogen phthalate, KHC8H4O4 (MM is 204.2 g/mol) needed to react completely with 20 mL of 0.1 M NaOH solution.
The values of the specific rotation, [alpha]20D, for the alpha and beta anomers of D-galactose are 150.7 and 52.8 degrees, respectively. A mixture that is 20% of alpha-D-galactose and 80% beta-D-galactose is dissolved in water at 20 degrees C.
how many moles of glucose, C6H12O6 can be burned when 60.0 mol of O2 is available?
Distance between two consecutive peaks or troughs. Frequency () Number of waves per second that pass through a given point in space. How are frequency and wavelength related? Example: Are gamma rays ( = 10-12 m) a form of high or low frequency rad..
how to calculate ksp of Ca(OH)2 at 296.25K and 364.95K with Ca(OH)2 being titrated with 0.0523M of HCl and 7.80mL of it added at 296.25K
At 0°C, the volume coefficient of expansion of mercury is α = 18×10-5 K-1, and its coefficient of compressibility is β = 5.32×10-6 bar-1.
captain kirk of the starship enterprise, has been told by his superiors that only a chemist can be trusted with the combination to the safe containing the dilithium crystals that power the ship.
How many neighboring hydrogen atoms must the CH2 group (at 2.65 ppm H NMR ) of propyl amine see in order to have its signal split into a triplet
How many grams of Na3PO4 will be needed to produce 300 mL of a solution that has a concentration of Na+ ions of 1.50 M?
An unknown metal X with a mass of 28 grams absorbs 58 J of heat. calculate the heat capacity if Its temperature raises from 31.1 °C to 39.9 °C.
An acidic aqueous solution of AlBr3 is in an electrolytic cell. What reactions take place at the anode and the cathode.
have a buffer solution composed of 4.00 mol of acid and 1.75 mol of the conjugate base. If the pKa of the acid is 2.20, what is the pH of the buffer?
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