Question

Why are the phospholipids in the cell membrane arranged the way that they are?

Answer 1

there is no reason for this about their arrangement but we can say phospholipid surrounds the polar molecules within the cell membrane and for this there is a reason that as we know cell membrane is bilipid layer .. and this type of arrangement is seen by microscope so we cant predict that y only thi type of arrangement is seen

Answer 2

in natural condition phospholipids of cell membrane is surrounded by water. due to the presence of hydrophobic and hydrophilic parts in phosopholipids the molecules actually arrange itself in to double layer (hydrophobic part inside and other part outside)because the presence of water around. Without water there will be no double membrane. eg if we put the membrane in hydrophobic substances or oils the membrane property will change. One interesting thing is Glyoxisomes (specialized peroxisomes found in plants usually for storage of fat/oil) is single membrane (hydrophobic part inside and in contact with the storage material) organelle because it has to store hydrophilic substance inside.