Multiple Choice
Which three nitrogenous bases are found in both DNA and RNA?
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11. Translation
The Genetic Code
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Which base pairs are typically found in the DNA of a cell?
A
Thymine–Uracil and Adenine–Guanine
B
Adenine–Uracil and Guanine–Cytosine
C
Adenine–Thymine and Guanine–Cytosine
D
Adenine–Cytosine and Guanine–Thymine
Verified step by step guidance1
Recall that DNA is composed of four nitrogenous bases: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C).
Understand that base pairing in DNA follows Chargaff's rules, where Adenine pairs specifically with Thymine, and Guanine pairs specifically with Cytosine.
Note that Uracil (U) is not found in DNA; it is present in RNA and pairs with Adenine during RNA transcription.
Therefore, the typical base pairs in DNA are Adenine–Thymine (A–T) and Guanine–Cytosine (G–C).
Use this knowledge to eliminate options involving Uracil or incorrect pairings, confirming that Adenine–Thymine and Guanine–Cytosine are the correct base pairs in DNA.
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