Problem: The DNA nitrogen bases that are purines are:  a. Adenine and thymine b. Adenine and uracil c. Guanine and thymine d. Guanine and cytosine e. Adenine and guanine

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The DNA nitrogen bases that are purines are: 

a. Adenine and thymine

b. Adenine and uracil

c. Guanine and thymine

d. Guanine and cytosine

e. Adenine and guanine