[Campbell Biology P.135] Which of the following statements correctly highlights a key differ... | Practice Question

Which of the following statements correctly highlights a key difference between DNA and RNA molecules as described in the text?

  • A: DNA contains thymine (T) and RNA contains uracil (U), but both utilize adenine (A), guanine (G), and cytosine (C).
  • B: DNA is typically a single strand, while RNA forms a double helix.
  • C: DNA relies on hydrogen bonds for base pairing, whereas RNA does not.
  • D: DNA molecules are generally shorter and less variable in shape compared to RNA molecules.

Explanation

The text explicitly states that 'Note that in RNA, adenine A pairs with uracil U ; thymine T is not present in RNA.' It also mentions that both DNA and RNA use A, G, and C. Therefore, option A accurately describes a key difference.