Multiple Choice
In the structure of DNA, which sugar is present in the backbone of each nucleotide?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
Which set correctly lists the four nitrogenous bases found in DNA?
A
Adenine, thymine, cytosine, guanine
B
Adenine, thymine, cytosine, uracil
C
Adenine, uracil, cytosine, guanine
D
Ribose, phosphate, adenine, thymine
Verified step by step guidance1
Recall that DNA is composed of four nitrogenous bases which are categorized into two groups: purines and pyrimidines.
Identify the purine bases in DNA, which are adenine (A) and guanine (G).
Identify the pyrimidine bases in DNA, which are 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.
Recognize that ribose and phosphate are components of the DNA backbone, not nitrogenous bases, so options including these are incorrect.
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