Which of the following are nitrogenous bases of the purine type? 15:09 Biology Chapter 5 Which of the following are nitrogenous bases of the purine type? A) cytosine and guanine B) guanine and adenine C) adenine and thymine D) thymine and uracil E) uracil and cytosine Answer: B) guanine and adenine Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+