객관식
In the DNA double helix, which two molecules form the repeating sugar-phosphate backbone of each strand?
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7. DNA and Chromosome Structure
DNA Structure
객관식
In double-stranded DNA, adenine (A) base-pairs with which nitrogenous base?
A
Guanine (G)
B
Cytosine (C)
C
Thymine (T)
D
Uracil (U)
검증된 단계별 안내1
Recall the base-pairing rules in double-stranded DNA, which are governed by complementary hydrogen bonding between nitrogenous bases.
Identify that adenine (A) is a purine, and in DNA, purines pair specifically with pyrimidines to maintain a uniform structure.
Remember that in DNA, adenine (A) pairs with thymine (T) through two hydrogen bonds.
Note that guanine (G) pairs with cytosine (C), and uracil (U) is found only in RNA, replacing thymine.
Therefore, adenine (A) base-pairs with thymine (T) in double-stranded DNA.
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