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Which components form the backbone of a DNA molecule?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following components forms the backbone of DNA?
A
Alternating sugar and phosphate groups
B
Nitrogenous bases only
C
Fatty acid chains
D
Amino acids
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Recall the basic structure of DNA, which consists of three main components: nitrogenous bases, sugar molecules, and phosphate groups.
Understand that the backbone of DNA is formed by repeating units that provide structural support and stability to the molecule.
Identify that the nitrogenous bases (adenine, thymine, cytosine, guanine) are attached to the sugar molecules but do not form the backbone themselves.
Recognize that the backbone is made up of alternating sugar (deoxyribose) and phosphate groups linked together by phosphodiester bonds.
Conclude that the correct answer is the alternating sugar and phosphate groups, as they form the continuous backbone of the DNA strand.
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