Multiple Choice
Which statement is true about the structure of a double-stranded DNA molecule?
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14. DNA Synthesis
Discovering the Structure of DNA
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Which two molecules form the backbone of the DNA ladder?
A
Deoxyribose sugar and nitrogenous bases
B
Ribose sugar and nitrogenous bases
C
Ribose sugar and phosphate
D
Deoxyribose sugar and phosphate
Verified step by step guidance1
Understand the structure of DNA: DNA is a double helix composed of two strands that form a ladder-like structure.
Identify the components of the DNA structure: The sides of the ladder are known as the backbone, and the rungs are composed of nitrogenous base pairs.
Recognize the components of the DNA backbone: The backbone is made up of alternating sugar and phosphate groups.
Differentiate between the types of sugars: DNA contains deoxyribose sugar, while RNA contains ribose sugar.
Conclude that the DNA backbone is formed by deoxyribose sugar and phosphate groups, not nitrogenous bases.
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