Multiple Choice
In the context of DNA structure, the monomers (building blocks) of DNA and RNA are:
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In double-stranded DNA, adenine (A) always pairs with which base according to Watson-Crick base pairing rules?
A
Thymine (T)
B
Cytosine (C)
C
Guanine (G)
D
Uracil (U)
Verified step by step guidance1
Recall the Watson-Crick base pairing rules which describe how nitrogenous bases pair in double-stranded DNA.
Identify that adenine (A) is a purine base, which pairs specifically with a pyrimidine base to maintain uniform DNA structure.
According to the rules, adenine (A) pairs with thymine (T) through two hydrogen bonds.
Note that cytosine (C) pairs with guanine (G), and uracil (U) is found only in RNA, not DNA.
Therefore, adenine (A) always pairs with thymine (T) in double-stranded DNA.
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