Question

question 2 1 pts which of these are the dna nucleotides that are called purines? adenine and thymine cytosine and adenine guanine and cytosine adenine and guanine none of these pairs are considered dna purines

Explanation:

DNA nucleotides are classified as purines or pyrimidines. Purines have a double - ring structure. Adenine (A) and guanine (G) are the purines in DNA. Thymine (T) and cytosine (C) are pyrimidines which have a single - ring structure.

Answer:

D. adenine and guanine