Multiple Choice
In DNA, which nitrogenous base pairs with adenine?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA, which nitrogenous base always pairs with adenine (A) according to complementary base-pairing rules?
A
Uracil (U)
B
Cytosine (C)
C
Guanine (G)
D
Thymine (T)
Verified step by step guidance1
Recall the basic principle of complementary base pairing in DNA, where specific nitrogenous bases pair with each other to maintain the double helix structure.
Identify the four nitrogenous bases found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G).
Understand that adenine (A) pairs specifically with thymine (T) through two hydrogen bonds, ensuring the DNA strands are complementary.
Note that uracil (U) is found in RNA, not DNA, and it pairs with adenine in RNA instead of thymine.
Conclude that according to complementary base-pairing rules in DNA, adenine (A) always pairs with thymine (T).
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