EP BIOLOGY,AP ED. -1 YR EBK.SUBSCRIPT.
EP BIOLOGY,AP ED. -1 YR EBK.SUBSCRIPT.
12th Edition
ISBN: 9780076758050
Author: Mader
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 12, Problem 4A
Summary Introduction

Introduction:

There are two types of nitrogenous bases: purines and pyrimidines. Adenine and guanine are the purine bases that are double ring structures. Cytosine and thymine are the pyrimidines bases that have single ring structure. The purine bases pair with their complementary pyrimidine bases and form a nucleotide sequence in DNA molecule.

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