Answer
Both strands can't face the same way because of Hydrogen bonding between Purine of one strand and Pyramidine of the other strand. One of the strands has to be inverted for this bonding to take place.
Work Step by Step
Given above
Microbiology: An Introduction, 11th Edition
by Tortora, Gerard J.; Funke, Berdell R.; Case, Christine L.
Published by
Benjamin Cummings
ISBN 10:
0321733606
ISBN 13:
978-0-32173-360-3
Chapter 8 - Figure 8.4 - Adding a nucelotide to DNA - Question - Page 212: 2
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