Answer:
Using an electron microscope, you observe bacterial cells from an environmental sample. You view a region of the bacterial cells that contains the chromosome. You identify and label the region as the: nucleoid
Step-by-step explanation:
The nucleoid is an irregular region, with a disordered appearance located inside the prokaryotic cells and characterized by being the place where the DNA is located, there the bacterial DNA is distinguished as the only long two-chain molecule forming the so-called bacterial chromosome which condenses being visible as a nucleoid. On these bases therefore, the nucleoid is a structure that contains a single chromosome. In addition to its genome, it has RNA molecules and a wide variety of enzymes such as RNA polymerase and topoisomerases, and basic proteins.