Multiple Choice
In DNA structure, the backbone of DNA is primarily made up of which components?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In double-stranded DNA, adenine (A) always pairs with which base via hydrogen bonds?
A
Cytosine (C)
B
Thymine (T)
C
Guanine (G)
D
Uracil (U)
Verified step by step guidance1
Recall the base pairing rules in double-stranded DNA, which are based on complementary hydrogen bonding between specific nitrogenous bases.
Identify that adenine (A) is a purine base, and in DNA, it pairs with a pyrimidine base to maintain the uniform width of the DNA double helix.
Remember that adenine pairs specifically with thymine (T) in DNA through two hydrogen bonds, ensuring stable base pairing.
Note that cytosine (C) pairs with guanine (G) via three hydrogen bonds, and uracil (U) is found only in RNA, replacing thymine.
Conclude that in double-stranded DNA, adenine (A) always pairs with thymine (T) via hydrogen bonds.
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