Final answer:
Given the information that researchers constructed and compared the genome from ancient DNA samples with modern bacteria, the statement about obtaining enough DNA to reconstruct the genome is true.
Step-by-step explanation:
The statement 'The researchers were able to obtain enough DNA to reconstruct the genome' is true based on the provided information that describes the successful construction and comparison of the genomic sequence from ancient DNA samples with modern bacterial strains.
In the context of the various statements provided, they collectively illustrate different instances where DNA analysis has been pivotal. Whether it's matching DNA sequences to establish relationships, tagging DNA with isotopes to confirm it as genetic material, comparing sequences to understand evolutionary relationships, or using DNA in historical investigations — all of these underline DNA's role as the bearer of heritable information.