Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 21 - Sections 21.1-21.7 - Exercises - Problems by Topic - Page 1031: 65

Answer

Illustrated below:

Work Step by Step

Purines includes adenine and guanine. These are two ringed bases (also known as bicyclic bases).
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