Multiple Choice
The two complementary DNA strands that make up the double helix run parallel to each other.
4. DNA, Chromosomes, and Genomes
Structure and Function of DNA
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Which of the following is not a purine nucleotide?
A
Adenine
B
Thymine
C
Guanine
Verified step by step guidance1
Understand the structure of nucleotides: Nucleotides are the building blocks of nucleic acids and consist of a nitrogenous base, a sugar, and one or more phosphate groups.
Identify the two types of nitrogenous bases: Purines and pyrimidines. Purines have a two-ring structure, while pyrimidines have a single-ring structure.
Recognize the purine bases: In DNA and RNA, the purine bases are adenine (A) and guanine (G).
Identify the pyrimidine bases: In DNA, the pyrimidine bases are cytosine (C) and thymine (T), while in RNA, uracil (U) replaces thymine.
Determine which base is not a purine: Since adenine and guanine are purines, and thymine is a pyrimidine, thymine is not a purine nucleotide.
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