Multiple Choice
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 is a feature shared by both DNA and RNA?
A
Both are typically double-stranded molecules.
B
Both contain the nitrogenous base thymine.
C
Both contain deoxyribose as their sugar.
D
Both contain a phosphate backbone.
Verified step by step guidance1
Recall the basic structural components of nucleic acids: DNA and RNA are both polymers made up of nucleotides, each consisting of a sugar, a phosphate group, and a nitrogenous base.
Identify the sugar component: DNA contains deoxyribose, while RNA contains ribose. This means they differ in their sugar moiety.
Examine the nitrogenous bases: DNA contains thymine, whereas RNA contains uracil instead of thymine.
Consider the strand structure: DNA is typically double-stranded, forming a double helix, while RNA is usually single-stranded.
Recognize the common feature: both DNA and RNA have a backbone made of alternating sugar and phosphate groups, known as the phosphate backbone.
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