Question

Which of the following is/are correct for Watson-Crick model of DNA structure?

• A. DNA is a double stranded helical structure.
• B. The two strands of DNA are anti-parallel.
• C. The two strands of DNA are parallel.
• D. The pitch is 34 A$°$ containing 10 base pairs.

Answer 1

Answer: (A), (B), (D)

The pitch is 34 A$°$ containing 10 base pairs.

Watson-Crick model of DNA structure is the B type DNA. It suggested that:

• DNA is a double stranded helical structure.
• The two strands of DNA are anti-parallel.
• The two strands are complementary to each other i.e., A pairs with T and G pairs with C.
• The full turn of helical strand (pitch) is 34 A$°$ containing 10 base pairs.