Before revision: In bacteria such as Escherichia coli, DNA is compacted into a nucleoid near the cell center, while ribosomes - molecular complexes that translate messenger RNAs (mRNAs) into proteins - are  localized at the poles.
After revision: In bacteria such as Escherichia coli, DNA is compacted into a nucleoid near the cell center, while ribosomes - molecular complexes that translate messenger RNAs (mRNAs) into proteins - are mainly localized at the poles.