Multiple Choice
Which of the following best describes the basic structure of a DNA molecule?
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7. DNA and Chromosome Structure
DNA Structure
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In the structure of DNA, what are the sides (backbone) of the DNA ladder composed of?
A
Alternating sugar and phosphate groups
B
Nitrogenous base pairs
C
Fatty acid chains
D
Amino acids
Verified step by step guidance1
Recall the basic structure of DNA, which is often described as a double helix resembling a twisted ladder.
Identify the components of the DNA ladder: the 'rungs' are made of nitrogenous base pairs, while the 'sides' or backbone are made of repeating units.
Understand that the backbone consists of alternating sugar and phosphate groups linked together by phosphodiester bonds.
Recognize that nitrogenous bases (adenine, thymine, cytosine, guanine) attach to the sugar molecules but do not form the backbone itself.
Conclude that the sides (backbone) of the DNA ladder are composed of alternating sugar and phosphate groups.
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