Which description best characterizes the structure and strand orientation of DNA?

Which description best characterizes the structure and strand orientation of DNA?

• A. DNA consists of a single strand with the sugar-phosphate backbone on the inside and bases on the outside.
• B. DNA is a double helix with two strands oriented in the same direction.
• C. DNA forms a triple helix with bases pairing in a criss-cross pattern.
• D. DNA is a double helix of two antiparallel strands with the sugar-phosphate backbone on the outside and base pairs A-T and G-C forming hydrogen bonds on the inside.

Answer: (D)