[Campbell Biology P.369] According to the text, which of the following correctly classifies ... | Practice Question

According to the text, which of the following correctly classifies the nitrogenous bases found in DNA?

  • A: Purines: Adenine (A) and Cytosine (C); Pyrimidines: Guanine (G) and Thymine (T)
  • B: Purines: Guanine (G) and Thymine (T); Pyrimidines: Adenine (A) and Cytosine (C)
  • C: Purines: Adenine (A) and Guanine (G); Pyrimidines: Cytosine (C) and Thymine (T)
  • D: Purines: Cytosine (C) and Thymine (T); Pyrimidines: Adenine (A) and Guanine (G)

Explanation

The text explicitly states: 'Adenine and guanine are purines, nitrogenous bases with two organic rings, while cytosine and thymine are nitrogenous bases called pyrimidines, which have a single ring.'