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In the DNA double helix, where are the sugar-phosphate backbones and the nitrogenous bases located?
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7. DNA and Chromosome Structure
DNA Structure
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Which compound is NOT a component of a DNA nucleotide?
A
Adenine
B
Uracil
C
Deoxyribose
D
Phosphate group
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Recall the basic structure of a DNA nucleotide, which consists of three components: a nitrogenous base, a five-carbon sugar, and a phosphate group.
Identify the nitrogenous bases found in DNA nucleotides: adenine (A), thymine (T), cytosine (C), and guanine (G).
Recognize that the sugar in DNA nucleotides is deoxyribose, a five-carbon sugar lacking one oxygen atom compared to ribose.
Understand that the phosphate group links nucleotides together to form the DNA backbone.
Note that uracil is a nitrogenous base found in RNA nucleotides, replacing thymine, and therefore is NOT a component of DNA nucleotides.
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