Final answer:
A bacterium's complete chromosome is located in the nucleoid, an irregularly-shaped section in the cytoplasm where the DNA is concentrated. Bacteria do not have a true nucleus like eukaryotic cells.
Step-by-step explanation:
The complete chromosome of a bacterium is located in an area called the nucleoid. Unlike eukaryotic cells, which have their chromosomes enclosed within a membrane-bound nucleus, bacteria are prokaryotes and do not have a true nucleus. Instead, the bacterial chromosome is found in the nucleoid region of the cell, which is an irregularly-shaped section in the cytoplasm where the DNA is concentrated. Bacteria may also have small circles of DNA called plasmids, but these are not the main chromosome and usually carry only a few genes.