Multiple Choice
Which of the following DNA strands correctly pairs with the strand 5'-ATCG-3' by base pairing?
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14. DNA Synthesis
Discovering the Structure of DNA
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Which of the following components is found in DNA but not in RNA?
A
Phosphate group
B
Uracil
C
Ribose
D
Thymine
Verified step by step guidance1
Understand the basic structure of nucleic acids: DNA and RNA are both nucleic acids composed of nucleotides, which include a sugar, a phosphate group, and a nitrogenous base.
Identify the sugar component: DNA contains deoxyribose sugar, while RNA contains ribose sugar. This difference is not the focus of the question.
Examine the nitrogenous bases: DNA contains adenine, guanine, cytosine, and thymine. RNA contains adenine, guanine, cytosine, and uracil.
Recognize the unique base in DNA: Thymine is found in DNA but is replaced by uracil in RNA.
Conclude which component is exclusive to DNA: Thymine is the component found in DNA but not in RNA.
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