A prokaryote is any organism with a cell that lacks a well-defined nucleus, as opposed to a eukaryote with a nucleus. Prokaryotes have a nucleoid area instead of a nucleus, which contains the genetic elements.
While prokaryotes lack mitochondria, the whole process of respiration takes place in the cytoplasm, requiring no ATP to carry across the organelle.
In bacteria, one glucose produces 38 ATPs, but in eukaryotic cells, one glucose produces 36 ATPs.