Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 20 - 20.1 - Concept Check: 4

Answer

PCR avoids shortening the DNA ends because it uses a DNA primer which bonds starting at the end of the DNA to be copied and becomes part of the new copy.

Work Step by Step

The copying in Fig. 16.20 uses an RNA primer--this is what cells do since they have activities to go back and remove the primer and replace it with DNA. PCR avoids this need by starting with a DNA primer.
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