what kind of side chain (non-polar, polar, or charged) is most common for amino acids in the helical, membrane spanning parts of the protein

Nucleus is the organelle that contains chromosomes

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it

Everything that you need in a lab is in your lab