Multiple Choice
In terms of nitrogenous bases, which base is found in mRNA but not in DNA?
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7. DNA and Chromosome Structure
RNA
Multiple Choice
The structure of RNA differs from DNA in that RNA typically:
A
Contains ribose sugar and the base uracil (U) instead of deoxyribose sugar and thymine (T)
B
Has a phosphate group replacing the sugar in its backbone
C
Is usually double-stranded and uses thymine (T) as a nitrogenous base
D
Contains deoxyribose sugar and the base thymine (T) instead of ribose sugar and uracil (U)
Verified step by step guidance1
Understand the basic chemical components of nucleic acids: both DNA and RNA are made up of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base.
Recall that the sugar in DNA is deoxyribose, which lacks one oxygen atom compared to ribose, the sugar found in RNA.
Identify the nitrogenous bases in DNA and RNA: DNA contains adenine (A), thymine (T), cytosine (C), and guanine (G), whereas RNA contains adenine (A), uracil (U), cytosine (C), and guanine (G).
Note the structural difference in strand formation: DNA is typically double-stranded forming a double helix, while RNA is usually single-stranded.
Combine these points to conclude that RNA differs from DNA by having ribose sugar instead of deoxyribose and uracil (U) instead of thymine (T), and it is usually single-stranded.
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