$1.$ Construct a glycerophospholipid using the following components: stearic acid, oleic acid, glycerol, phosphate, and serine. Beside your structure, draw a cartoon rendering of it showing the amphiphilic polar head and hydrophobic tails.

$2.$ Construct a glycerophospholipid using the following components: stearic acid, oleic acid, glycerol, phosphate, and serine. Beside your structure, draw a cartoon rendering of it showing the amphiphilic polar head and hydrophobic tails.

$3.$ Describe the fluid mosaic model for lipid bilayers. Describe longitudinal or transverse motion of phospholipids within the membrane and discuss the key difference in these motions. Describe the two main types of membrane prote

$4.$ In units of kJ$/$mol and at $37$oC$,$ compute the free energy for passive diffusion of Ca$2+$ ions across a membrane in the thermodynamically favored direction, when one side of the membrane has a $[$Ca$2+]=2\mathrm{.}5$ mM and the other side has a $[$Ca$2+]=25$ mM$.$ The membrane has a potential of $+50\mathrm{.}0$ mV$.$