Multiple Choice
Which component forms the backbone of the DNA molecule?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following lists correctly identifies the four nitrogenous bases found in DNA?
A
Adenine, Thymine, Guanine, Uracil
B
Adenine, Thymine, Guanine, Cytosine
C
Adenine, Thymine, Guanine, Adenosine
D
Adenine, Uracil, Guanine, Cytosine
Verified step by step guidance1
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: Thymine (T) and Cytosine (C).
Note that Uracil (U) is found in RNA, not DNA, so any list containing Uracil is incorrect for DNA bases.
Confirm that the correct list of DNA nitrogenous bases is Adenine, Thymine, Guanine, and Cytosine.
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