Question

In prokaryotes DNA are negative charge why??

Answer 1

Bacterial cell wall has a negative charge. In Gram positive bacteria the reason of this negative charge is the presence of teichoic acids linked to either the peptidoglycan or to the underlying plasma membrane. These teichoic acids are negatively charged because of presence of phosphate in their structure.

The Gram negative bacteria have an outer covering of phospholipids and Lipopolysaccharides. The lipopolysaccharides impart a strongly negative charge to surface of Gram negative bacterial cells.