Multiple Choice
In the DNA double helix, what feature makes the two strands antiparallel?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the structure of DNA, which sugar is found in the nucleotide backbone?
A
Fructose
B
Glucose
C
2-deoxyribose
D
Ribose
Verified step by step guidance1
Recall that DNA (deoxyribonucleic acid) is composed of nucleotides, each containing a phosphate group, a nitrogenous base, and a sugar molecule.
Understand that the sugar in the nucleotide backbone of DNA is a five-carbon sugar, which is a key structural component linking the phosphate groups and bases.
Differentiate between the sugars found in nucleic acids: ribose is found in RNA, while DNA contains a modified sugar called 2-deoxyribose, which lacks one oxygen atom compared to ribose.
Recognize that fructose and glucose are six-carbon sugars (hexoses) and are not components of the DNA backbone.
Conclude that the sugar found in the nucleotide backbone of DNA is 2-deoxyribose, which provides the structural framework for the DNA molecule.
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