Scientists identify a tumor cell in rats that divides more rapidly in the presence of galactose. When they sequence the DNA of the tumor cells, they identify retroviral DNA. Explain what circumstances might have occurred that produced this phenotype.

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Genome annotation

The technique of linking biological information to genome sequences is termed genome annotation. Gene annotation is the method of identifying gene locations and coding sections. It helps us understand what these genes are doing in the body through establishing structural characteristics and linking them to the actions of various proteins.