Multiple Choice
In the context of DNA structure, which letter represents the sugar component in the nucleotide backbone?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following accurately describes the general structure of DNA and RNA?
A
Both DNA and RNA are double-stranded molecules containing deoxyribose sugar.
B
DNA contains uracil instead of thymine, while RNA contains thymine instead of uracil.
C
RNA is a double-stranded helix, and DNA is a single-stranded molecule.
D
DNA is typically a double-stranded helix with deoxyribose sugar, while RNA is usually single-stranded with ribose sugar.
Verified step by step guidance1
Step 1: Understand the sugar component in nucleic acids. DNA contains deoxyribose sugar, which lacks one oxygen atom compared to ribose sugar found in RNA.
Step 2: Recognize the nitrogenous bases. DNA uses thymine (T) while RNA uses uracil (U) instead of thymine.
Step 3: Identify the strand structure. DNA is typically double-stranded forming a double helix, whereas RNA is usually single-stranded.
Step 4: Summarize the differences: DNA = double-stranded, deoxyribose sugar, thymine; RNA = single-stranded, ribose sugar, uracil.
Step 5: Use this information to evaluate the given options and select the one that correctly describes DNA and RNA structure.
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