Discussion
In the time since E. coli and Salmonella diverged evolutionarily
Answer: C
Correct answer: E. coli has acquired many genes via horizontal transfer
Comparison of the two genomes shows a substantial fraction of the E. coli chromosome differing in base composition and codon usage from the rest, which marks it as foreign in origin. Several hundred kilobases appear to have arrived by horizontal transfer since the two lineages separated, and much of what distinguishes the two species lies in that acquired material.
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