Which statement describes the phospholipid bilayer that makes up a cell membrane? A.) The hydrophobic heads point into and out of the cell, while the hydrophilic tails form a layer between the heads.
B.) The hydrophobic tails point into and out of the cell, while the hydrophilic heads form a layer between the tails.
C.) The hydrophilic heads point into and out of the cell, while the hydrophobic tails form a layer between the heads.
D.) The hydrophilic tails point into and out of the cell, while the hydrophobic heads form a layer between the tails.

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.