Multiple Choice
In DNA, what nucleotide base pairs with cytosine?
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4. Biomolecules
Nucleic Acids
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How do the secondary structures of DNA and RNA differ?
A
Both DNA and RNA form double helices.
B
Both DNA and RNA form single-stranded structures.
C
DNA forms a double helix, while RNA typically forms a single-stranded structure.
D
DNA forms a single-stranded structure, while RNA forms a double helix.
Verified step by step guidance1
Begin by understanding the basic structures of DNA and RNA. DNA is typically found as a double-stranded molecule forming a double helix, while RNA is usually single-stranded.
Consider the chemical differences between DNA and RNA. DNA contains the sugar deoxyribose, whereas RNA contains the sugar ribose. This difference contributes to their structural properties.
Examine the base pairing rules. In DNA, adenine pairs with thymine and cytosine pairs with guanine, which helps stabilize the double helix structure. RNA, however, pairs adenine with uracil instead of thymine.
Explore the functional roles of DNA and RNA. DNA's double helix structure is ideal for storing genetic information, while RNA's single-stranded form allows it to be versatile in functions such as protein synthesis and regulation.
Conclude by summarizing that DNA forms a stable double helix structure, essential for long-term genetic storage, whereas RNA's single-stranded structure allows it to perform various roles in the cell, including acting as a messenger and catalyst.
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