Question

Which nucleotide bases are purines?

a. adenine & guanine
b. adenine & thymine
c. guanine & cytosine
d. cytosine& thymine

Answer 1

a. adenine and guanine

Step-by-step explanation:

A purines nucleotide is a combination of the heterocyclic aromatic rings, the imidazole and pyrimidine ring.