Multiple Choice
Which two components of a nucleotide are covalently bonded to form the backbone of DNA?
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7. DNA and Chromosome Structure
DNA Structure
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In the DNA double helix, where are the sugar-phosphate backbones and the nitrogenous bases located?
A
The sugar-phosphate backbones are on the outside of the helix, while the nitrogenous bases are on the inside, paired between the two strands.
B
The nitrogenous bases form the outer surface of the helix, and the sugar-phosphate backbones are on the inside.
C
Both the sugar-phosphate backbones and the nitrogenous bases are located on the outside of the helix.
D
The sugar-phosphate backbones and nitrogenous bases are randomly distributed throughout the helix.
Verified step by step guidance1
Recall the structure of the DNA double helix, which consists of two strands twisted around each other.
Understand that each strand is made up of a sugar-phosphate backbone and nitrogenous bases attached to the sugar.
Recognize that the sugar-phosphate backbones form the structural framework and are located on the outside of the helix to provide stability.
Know that the nitrogenous bases pair specifically (A with T, and G with C) and are located on the inside of the helix, forming base pairs that hold the two strands together.
Conclude that the sugar-phosphate backbones are on the outside, while the nitrogenous bases are on the inside, paired between the two strands.
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