Ascientist investigated dna replication in two groups of cells, labeled a and b. she injected radioactively labeled nucleotides into cells of each group and allowed dna replication to begin. when replication was halfway completed, she injected a drug into the cells to stop replication. she then examined the cells to determine the distribution of the newly-synthesized dna. she found each cell of group a had many segments of new dna in its nucleus, while each cell of group b had a single segment of new dna in its cytoplasm. what can the researcher conclude about the cells?

answer:

the given information concludes that the cells in group b are prokaryotes as they replicate their dna in the cytoplasm and the cells in group a are eukaryotic as they replicate their dna in the nucleus.

explanation:

the outcome of the given experiment, where group b had a single segment of new dna in its cytoplasm and group a had many segments of new dna in its nucleus evidently suggests that the replication of dna had taken place.  

as the eukaryotic cell possesses a nucleus, therefore, the replication of dna takes place in the nucleus, as evident in cell a. on the other hand, the prokaryotes do not exhibit nucleus, and thus, its segment of dna is witnessed in cytoplasm as evident in the cell b. hence, it can be concluded that the cell a is a eukaryotic cell and the cell b is a prokaryotic cell.