Which if the following is not a product of the krebs cycle?
a) water
b) carbon dioxide
c) atp or gtp
d) fadh2

The answer is reflection.

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

Both prokaryotic and eukaryotic cells have ribosomes and cell membranes