Multiple Choice
Which type of bond primarily holds the two strands of DNA together in the double helix?
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
Thymine, uracil, cytosine, guanine
C
Adenine, uracil, cytosine, guanine
D
Adenine, thymine, cytosine, uracil
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: 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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