Answer
A
Work Step by Step
A purine is always hydrogen bonded with a pyrimidine: A pairs with T and C with G. These base pairs are the rungs of the ladder and the sugar phosphate acts as a backbone for the structure.
Biology 12th Edition
by Mader, Sylvia; Windelspecht, Michael
Published by
McGraw-Hill Education
ISBN 10:
0078024269
ISBN 13:
978-0-07802-426-9
Chapter 12 - Molecular Biology of the Gene - Assess - Page 226: 2
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