객관식
In the DNA double helix, what type of interaction primarily holds complementary nitrogenous bases together across the two strands?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
Which set correctly lists the four nucleotides found in DNA?
A
Adenine, thymine, cytosine, and guanine
B
Adenine, thymine, guanine, and ribose
C
Adenine, thymine, cytosine, and uracil
D
Adenine, uracil, cytosine, and guanine
검증된 단계별 안내1
Recall that DNA is composed of four nitrogenous bases, which are the fundamental units of the genetic code.
Identify the two purines in DNA: adenine (A) and guanine (G), which have a double-ring structure.
Identify the two pyrimidines in DNA: cytosine (C) and thymine (T), which have a single-ring structure.
Note that uracil (U) is found in RNA, not DNA, and ribose is a sugar, not a nucleotide base.
Therefore, the correct set of nucleotides in DNA is adenine, thymine, cytosine, and guanine.
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