Which substances cannot diffuse through the lipid bilayer?

What does "icosahedral nucleocapside" and "lipid bilayer membrane" mean? Or what are they?

• I've went to dictionary.com and it said that even though all the words were spelled right that there wasn't a definition for them together, but i printed out a picture of the mumps and two areas that it had labeled was "icosahedral nucleocapsid" and "lipid bilayer membrane", so i wasn't sure what to do c/ i didnt no what they were. Basically i want to know if either one of those words is either a "coat" or a "special enzyme" for the viral desiese called "Mumps" or "Rubella". A website would be very appreciated. thnx.

• Answer:

  Icosahedral nucleocapside = the covering (capsid) of the viral nucleic acid (nucleo-), that in this case has an icosahedral shape (surrounded by 20 triangles). Lipid bilayer membrane = a membrane (layer, covering) that is made up of two layers of lipids ("fats", in this case phospholipids). Lipid bilayer membranes form the covering of all human cells. The mumps virus belongs to the paramyxovirus family. Both the nucleocapsid and the lipid bilayer are "coats": they are components of the covering of the mumps virus. The nucleocapsid is on the outside, the lipid bilayer is the inner side. None of these have to do anything with enzymes. Enzymes are proteins with a certain function, like converting certain molecules into others.