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In the structure of DNA, what kind of sugar is found in the nucleotide backbone?
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7. DNA and Chromosome Structure
DNA Structure
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Which set correctly lists the four nitrogenous bases found in DNA?
A
Adenine, uracil, cytosine, guanine
B
Thymine, uracil, cytosine, guanine
C
Adenine, thymine, cytosine, guanine
D
Adenine, thymine, cytosine, uracil
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Recall that DNA is composed of four nitrogenous bases which are divided into two categories: purines and pyrimidines.
Identify the purines in DNA: adenine (A) and guanine (G).
Identify the pyrimidines in DNA: cytosine (C) and thymine (T).
Note that uracil (U) is found in RNA, not DNA, so any option containing uracil is incorrect for DNA bases.
Conclude that the correct set of nitrogenous bases in DNA is adenine, thymine, cytosine, and guanine.
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