Multiple Choice
In RNA, which of the following nitrogenous bases is typically not found?
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7. DNA and Chromosome Structure
RNA
Multiple Choice
Which component is found in RNA but not in DNA?
A
Deoxyribose sugar
B
Double-stranded antiparallel helix as the usual structure
C
Uracil (U)
D
Thymine (T)
Verified step by step guidance1
Understand the basic structural differences between DNA and RNA. Both are nucleic acids but differ in sugar components and nitrogenous bases.
Recall that DNA contains the sugar deoxyribose, while RNA contains ribose. This difference affects the stability and function of each molecule.
Identify the nitrogenous bases present in DNA and RNA. DNA has adenine (A), thymine (T), cytosine (C), and guanine (G), whereas RNA has adenine (A), uracil (U), cytosine (C), and guanine (G).
Note that thymine (T) is found only in DNA, and uracil (U) replaces thymine in RNA. This is a key distinguishing feature between the two molecules.
Conclude that the component found in RNA but not in DNA is uracil (U), which is a nitrogenous base unique to RNA.
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