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Answer:E. Adenine and Guanine

Explanation:

They are  double double carbon- nitrogen rings with  four nitrogen atoms bases  found  in  DNA and RNA. Purines always pair with pyrimidines(cytosine and thymine)  to form a double helix structure.This precise paring ensured that the DNA has a complementary structure.

This paring of purines with pyrimidines is by hydrogen bonds. This is to ensure easily unwinding during replication, that is formation of new DNA molecules.

purines bases are also used for  cell protein synthesis fro cell division.  

faithidahosa416

Answer:E. Adenine and Guanine

Explanation:the DNA is a long ,linear chain of subunits called nucleotides.each nucleotides contains a sugar phosphate which is deoxyribose phosphate and also nitrogenous bases.

Nitrogenous bases usually contains carbon, hydrogen, oxygen and nitrogen.

The nitrogenous base are adenine, cytosine, guanine and thymine.

Adenine and guanine are purines.

Cytosine and thymine are pryrimidine.

In RNA , thymine is replaced by uracil

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