Multiple Choice
In the context of DNA structure, DNA (deoxyribonucleic acid) is classified as which type of biomolecule?
7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA, adenine (A) always pairs with which nitrogenous base?
A
Uracil (U)
B
Cytosine (C)
C
Guanine (G)
D
Thymine (T)
Verified step by step guidance1
Recall the base pairing rules in DNA, which describe how nitrogenous bases pair with each other to form the double helix structure.
Understand that DNA is composed of four nitrogenous bases: adenine (A), thymine (T), cytosine (C), and guanine (G).
Remember that adenine (A) pairs specifically with thymine (T) through two hydrogen bonds, ensuring complementary base pairing.
Note that uracil (U) is found in RNA, not DNA, and pairs with adenine (A) in RNA instead of thymine.
Conclude that in DNA, adenine (A) always pairs with thymine (T), which maintains the structure and function of the DNA molecule.
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