Multiple Choice
In the double helix structure of DNA, how many hydrogen bonds hold adenine and thymine together?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following is found in DNA but not in RNA?
A
Uracil
B
Adenine
C
Thymine
D
Ribose
Verified step by step guidance1
Understand the basic chemical components of nucleic acids: DNA and RNA are both made up of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base.
Recall the nitrogenous bases found in DNA: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).
Recall the nitrogenous bases found in RNA: Adenine (A), Uracil (U), Cytosine (C), and Guanine (G).
Note the key difference in bases between DNA and RNA: DNA contains Thymine, whereas RNA contains Uracil instead of Thymine.
Conclude that Thymine is found in DNA but not in RNA, making it the correct answer to the question.
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