Question

The distance between two complementary strands of DNA almost remains the same because

• A. Hydrogen bonds between the complementary nitrogen bases of the two chains
• B. Hydrophobic interactions between nitrogen bases
• C. Base pairing between purines and pyramidines
• D. All the above

Answer 1

The correct option is D All the above

The distance between two complementary strands always remains the same because there are hydrogen bonds between the nitrogen bases of two strands restricting movement. The bonds are formed correctly on the opposite ie the bonds are between purines and pyrimidines.

Also, these interactions between nitrogen bases are hydrophobic.

So, the correct option is D.