Biology 2010 Student Edition

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

Chapter 12, DNA - 12.2 - The Structure of DNA - 12.2 Assessment - Page 348: 1b

Answer

Hydrogen bonds are responsible for keeping the DNA strands in the helix together

Work Step by Step

Cytosine and guanine form three hydrogen bonds and adenine and thymine form two double bonds. These hydrogen bonds between the base pairs are what keep the double helix in DNA together.
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