Is glucose a reactant in aerobic stages of cellular respiration?

YES

Glycosis helps to process glucose to pyruvate in many cellular respiration procedure. 

Cellular respiration is also considered a part of the metabolism process. This process actually helps in carrying the oxygen through the blood. 
Two types: Anaerobic and aerobic respiration 
Anaerobic respiration doesn't use oxygen during its respiration process while the aerobic respiration uses oxygen.

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