Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 4 - Nucleic Acids and the Origin of Life - 4.1 - Nucleic Acid Structures Reflect Their Functions - 4.1 Recap - Learning Outcomes - Page 70: 1


DNA: Deoxyribose sugar, double stranded, stable under basic conditions, thymine as a base pair instead of uracil. RNA: Ribose sugar, single stranded, more unstable in basic conditions, uracil as a base pair instead of thymine.

Work Step by Step

Purines and Pyrimidines are the nitrogenous bases that make up the two different nucleotide bases in DNA and RNA. The two-carbon nitrogen ring bases, adenine and guanine, are purines, and the one-carbon nitrogen ring bases, thymine and cytosine, are pyrimidines. Uracil replaces thymine as a pyrimidine for RNA.
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