Final answer:
Prokaryotic cells contain DNA, ribosomes, and sometimes plasmids, but they do not have a nucleus. So the correct options are A, C, and D.
Step-by-step explanation:
The question deals with what can be found in prokaryotic cells. In prokaryotic cells, (A) DNA is present but it is not contained within a nucleus; instead, it resides in a region known as the nucleoid. (B) A nucleus is not found in prokaryotic cells, as this is a feature of eukaryotic cells. (C) Ribosomes are the sites of protein synthesis and are indeed found in prokaryotic cells. (D) Plasmids, which are small, circular DNA molecules separate from chromosomal DNA, can also be present in prokaryotic cells. Therefore, the correct answers regarding what can be found in prokaryotic cells are A, C, and D.