[butterwings]

Which of the following are true statements ?

  a)   In a cell membrane the lipid bilayer is made up of molecules in which two polar fatty acid chains are bonded to a nonpolar head, which is itself a derivative of phosphate.

  b)   In a cell membrane, the molecules that make up the lipid bilayer have two hydrophobic fatty acid tails bonded to a hyrdophilic head.

  c)   The structure of the lipid bilayer of a cell is such that it allows the passage of all molecules and ions into the cell, thereby allowing most any chemical reaction to take place in the cell.

  d)   Noncovalent interactions are primarily responsible for bringng drugs, hormones, and neurotransmitters into contact with receptors in a cell's membrane.

i put  bc but it's wrong. please help me out asap!!! please! thank you!!!