Which of the following is true of nitrogenous bases?
A) Cytosine is the only purine.
B) Adenine is the only purine.
C) Adenine and thymine are purines.
D) Cytosine and thymine are purines.
E) Adenine and guanine are purines.

Question

Quizplus · Accepted Answer

Adenine and guanine are classified as purines, which are one of the two types of nitrogenous bases found in nucleic acids (the other type being pyrimidines). Cytosine, thymine (in DNA), and uracil (in RNA) are pyrimidines.

Which of the Following Is True of Nitrogenous Bases