Multiple Choice
Which statement correctly describes a key difference between DNA and RNA?
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7. DNA and Chromosome Structure
RNA
Multiple Choice
In molecular genetics, which component is found in both DNA and RNA?
A
Deoxyribose sugar
B
A thymine-only base pair
C
Uracil
D
Adenine
Verified step by step guidance1
Understand the basic components of nucleic acids: DNA and RNA are both made up of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base.
Identify the sugar component: DNA contains deoxyribose sugar, while RNA contains ribose sugar. Since these sugars differ, deoxyribose is not common to both.
Examine the nitrogenous bases: 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 is found only in DNA and uracil only in RNA, so these bases are not common to both nucleic acids.
Recognize that adenine is a nitrogenous base present in both DNA and RNA, making it the component common to both molecules.
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