Multiple Choice
How many distinct RNA polymerases are found in prokaryotic cells?
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7. DNA and Chromosome Structure
RNA
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Which of the following correctly describes three major differences between RNA and DNA?
A
RNA contains ribose sugar, uses uracil instead of thymine, and is usually single-stranded.
B
RNA contains deoxyribose sugar, uses uracil instead of thymine, and is usually single-stranded.
C
RNA is double-stranded, contains ribose sugar, and uses thymine instead of uracil.
D
RNA contains deoxyribose sugar, uses thymine instead of uracil, and is usually double-stranded.
Verified step by step guidance1
Step 1: Understand the sugar component difference between DNA and RNA. DNA contains deoxyribose sugar, which lacks one oxygen atom compared to ribose sugar found in RNA.
Step 2: Identify the nitrogenous bases used in DNA and RNA. DNA uses thymine (T), whereas RNA uses uracil (U) instead of thymine.
Step 3: Recognize the structural difference in strand number. DNA is typically double-stranded forming a double helix, while RNA is usually single-stranded.
Step 4: Compare each answer choice against these three criteria: sugar type (ribose vs. deoxyribose), base usage (uracil vs. thymine), and strand structure (single vs. double).
Step 5: Select the answer that correctly states RNA contains ribose sugar, uses uracil instead of thymine, and is usually single-stranded.
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