Final answer:
The absence of a nucleus in an organism results in its DNA not being compartmentalized, as seen in prokaryotic cells where DNA is found in a region called the nucleoid (option C).
Step-by-step explanation:
The consequence of an organism lacking a nucleus is C) cellular DNA is not compartmentalized. In prokaryotic cells, such as bacteria, there is no nucleus to enclose the DNA. Instead, the DNA is located in a region called the nucleoid, where it remains relatively concentrated but not separated from the rest of the cell by a membrane. While prokaryotic cells do contain DNA and are capable of protein synthesis with ribosomes, they do not have the same internal compartmentalization as eukaryotic cells. The lack of a nuclear membrane means that transcription and translation occur in close proximity within the cytoplasm.
Hence, the answer is option C.