[Campbell Biology P.367] According to the text, which statement accurately describes a key f... | Practice Question

According to the text, which statement accurately describes a key feature of the DNA double helix model constructed by Watson and Crick?

  • A: The sugar-phosphate backbones are located on the inside of the DNA molecule.
  • B: The nitrogenous bases are exposed to the aqueous surroundings.
  • C: The two sugar-phosphate backbones run in opposite directions, making them antiparallel.
  • D: Complementary base pairing means A pairs with G, and C pairs with T.

Explanation

The text explicitly states: 'Watson constructed such a model, in which the two sugar-phosphate backbones are antiparallel—that is, their subunits run in opposite directions.' This is a fundamental feature of the DNA double helix.