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In DNA structure, what components form the backbone of the DNA double helix?
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7. DNA and Chromosome Structure
DNA Structure
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In the context of DNA structure, which sugar is found in the backbone of DNA?
A
Deoxyribose
B
Glucose
C
Fructose
D
Ribose
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Understand that DNA (deoxyribonucleic acid) is composed of a sugar-phosphate backbone and nitrogenous bases.
Recall that the sugar in the backbone of DNA is a five-carbon sugar, which can be either ribose or deoxyribose.
Recognize that the difference between ribose and deoxyribose is the presence or absence of an oxygen atom on the 2' carbon; deoxyribose lacks one oxygen atom compared to ribose.
Since DNA is 'deoxy' (meaning 'without oxygen'), the sugar in its backbone is deoxyribose, not ribose, glucose, or fructose.
Therefore, identify deoxyribose as the sugar found in the backbone of DNA.
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