Multiple Choice
Which of these is a difference between a DNA and an RNA molecule?
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15. Gene Expression
Introduction to Types of RNA
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Which of the following is a key difference between RNA and DNA?
A
RNA contains uracil instead of thymine.
B
RNA is more stable than DNA.
C
RNA has a deoxyribose sugar while DNA has a ribose sugar.
D
RNA is double-stranded while DNA is single-stranded.
Verified step by step guidance1
Identify the structural components of RNA and DNA. RNA contains the sugar ribose, while DNA contains the sugar deoxyribose.
Examine the nitrogenous bases present in RNA and DNA. RNA contains adenine, guanine, cytosine, and uracil, whereas DNA contains adenine, guanine, cytosine, and thymine.
Consider the stability of RNA and DNA. DNA is generally more stable than RNA due to its double-stranded structure and the presence of deoxyribose.
Analyze the strand structure of RNA and DNA. DNA is typically double-stranded, forming a double helix, while RNA is usually single-stranded.
Conclude by identifying the key difference: RNA contains uracil instead of thymine, which is a fundamental distinction between the two nucleic acids.
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