Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 12, DNA - Standardized Test Prep - Page 359: 3



Work Step by Step

As discovered by the work of Watson and Crick, DNA is described as being a double helix. DNA also is described as a polymer made up of nucleotide subunits. This molecule also has a backbone made up of alternating sugar and phosphate groups. The only option that is NOT true is option C, which opposes the rule of base pairing. DNA does not contain adenine-guanine pairs; it contains adenine-thymine pairs and cytosine-guanine pairs.
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