Final answer:
Under certain conditions, B DNA can be converted to Z DNA by high salt concentrations and negative supercoiling.
Step-by-step explanation:
Under certain conditions, B DNA can be converted to Z DNA. The formation of Z DNA from B DNA is promoted by specific conditions, such as high salt concentrations and negative supercoiling.
High salt concentrations destabilize the B DNA structure and favor the formation of Z DNA. Negative supercoiling, which can be induced by enzymes called topoisomerases, helps facilitate the conversion to Z DNA.
It is important to note that the conversion from B DNA to Z DNA is not a common occurrence and is usually observed in specific circumstances.