What is a key structural difference between B-DNA and Z-DNA?

• A. Z-DNA is a left-handed helix, while B-DNA is right-handed.
• B. B-DNA is a left-handed helix, while Z-DNA is right-handed.
• C. B-DNA has more base pairs per helical turn than Z-DNA.
• D. Z-DNA is longer than B-DNA.

Answer: (A)