Multiple Choice
Which of the following best describes the structural make-up of a gene?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following structural features is unique to RNA and not found in DNA?
A
The presence of thymine as a nitrogenous base
B
The presence of ribose sugar
C
Phosphodiester bonds between nucleotides
D
A double-stranded helical structure
Verified step by step guidance1
Identify the key structural components of both DNA and RNA, focusing on their sugar, nitrogenous bases, bonding, and overall structure.
Recall that DNA contains deoxyribose sugar, while RNA contains ribose sugar; this difference is fundamental and unique to RNA.
Examine the nitrogenous bases: DNA has thymine, whereas RNA has uracil instead of thymine, so the presence of thymine is not unique to RNA.
Consider the type of bonds: both DNA and RNA have phosphodiester bonds linking nucleotides, so this feature is not unique to RNA.
Look at the overall structure: DNA is typically double-stranded and helical, while RNA is usually single-stranded, so a double-stranded helical structure is not unique to RNA.
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