Answer
A: the two strands unwind from each other.
Work Step by Step
This is done by an enzyme that can "unzip" the DNA between the nitrogen bases by breaking the hydrogen bonds that hold them together. The name of this enzyme is helicase.
Biology: The Unity and Diversity of Life (14th Edition)
by Starr, Cecie; Taggart, Ralph; Evers, Christine; Starr, Lisa
Published by
Brooks/Cole Publishing Co.
ISBN 10:
1305073959
ISBN 13:
978-1-30507-395-1
Chapter 8 - Self-Quiz - Page 146: 8
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