Biology 2010 Student Edition

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

Chapter 12, DNA - Assessment - 12.2 The Structure of DNA - Understand Key Concepts/Think Critically - Page 356: 10



Work Step by Step

Chargaff found that percentages of certain bases are almost always equal in any sample of DNA. For example, he found that the percentages of adenine and thymine were almost equal and the percentages of cytosine and guanine were almost identical. This discovery led to Chargaff's rule, which stated that adenine always paired with thymine whereas cytosine always paired up with guanine.
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