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In DNA structure, the twisted ladder shape of DNA is called a:
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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, thymine, cytosine, uracil
B
Thymine, uracil, cytosine, guanine
C
Adenine, thymine, cytosine, guanine
D
Adenine, uracil, cytosine, guanine
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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 not found in DNA; it is found in RNA instead, replacing thymine.
Therefore, the correct set of nitrogenous bases in DNA is adenine, thymine, cytosine, and guanine.
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