Lipids, mainly phospholipids, make up the bulk of the cell membrane. how is the structure of the phospholipid so perfectly paired to the function of the cell membrane?
a) phospholipids are bulky/large molecules that prevent all molecules from entering/exiting the cell.
b) the polar tails of the phospholipids provide the barrier between the exterior/interior hydrophilic environments.
c) lipids contain high energy bonds, and these bonds to provide the energy to move molecules across the membrane.
d) the head of the phospholipid, which is hydrophilic, to control the movement of large hydrophobic molecules, and the tails of the phospholipid, which are hydrophobic, to control the movement of large hydrophilic molecules.

The lipid bilayer in the cell membrane helps is the multiple functions executed by the membrane. The bilayer organization of the phospholipids in the membrane controls the movements of the different molecules in and out of the cell. The phospholipid have a hydrophobic end and a hydrophilic end. The hydrophilic ends of these phospholipids are in contact with the inside and the outside of the cell, while the hydrophobic parts are towards the center of the bilayer. The hydrophilic end controls the movement of the large hydrophobic molecules, and the hydrophobic tails controls the movement of large hydrophilic molecules.

Hence, the answer is 'Option D'.

this protocol describes a detailed procedure for intracellular flow cytometry staining.