Multiple Choice
Which of the following is a nitrogenous base found in DNA?
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7. DNA and Chromosome Structure
DNA Structure
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Which two components make up the backbone of a DNA molecule?
A
Ribose sugar and uracil
B
Adenine and thymine
C
Phosphate group and nitrogenous base
D
Deoxyribose sugar and phosphate group
Verified step by step guidance1
Recall the structure of a DNA molecule, which consists of a long chain of nucleotides.
Each nucleotide is composed of three parts: a phosphate group, a sugar molecule, and a nitrogenous base.
The backbone of the DNA molecule is formed by the sugar and phosphate groups linked together through phosphodiester bonds.
In DNA, the sugar is specifically deoxyribose, not ribose (which is found in RNA), and the nitrogenous bases (adenine, thymine, cytosine, guanine) attach to the sugar but are not part of the backbone.
Therefore, the two components that make up the backbone of DNA are the deoxyribose sugar and the phosphate group.
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