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Multiple Choice
Which of the following is a characteristic of RNA but not DNA?
A
Double-stranded structure
B
Contains uracil instead of thymine
C
Forms a double helix
D
Contains deoxyribose sugar
Verified step by step guidance
1
Identify the structural components of RNA and DNA. RNA contains ribose sugar, while DNA contains deoxyribose sugar.
Understand the nitrogenous bases present in RNA and DNA. RNA contains adenine, guanine, cytosine, and uracil, whereas DNA contains adenine, guanine, cytosine, and thymine.
Recognize the structural differences between RNA and DNA. RNA is typically single-stranded, while DNA is double-stranded and forms a double helix.
Focus on the unique presence of uracil in RNA. Unlike DNA, RNA uses uracil in place of thymine.
Conclude that the presence of uracil instead of thymine is a characteristic feature of RNA, distinguishing it from DNA.