Multiple Choice
Which form of genetic material initiates RNA interference (RNAi) in eukaryotic cells?
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7. DNA and Chromosome Structure
RNA
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How many distinct RNA polymerases are found in prokaryotic cells?
A
2
B
3
C
1
D
4
Verified step by step guidance1
Recall that RNA polymerase is the enzyme responsible for synthesizing RNA from a DNA template during transcription.
Understand that in prokaryotic cells, unlike eukaryotic cells, there is typically a single type of RNA polymerase that synthesizes all types of RNA (mRNA, tRNA, rRNA).
Recognize that this single RNA polymerase can associate with different sigma factors to initiate transcription at various promoters, but the core enzyme itself remains the same.
Contrast this with eukaryotic cells, which have multiple distinct RNA polymerases (I, II, and III) specialized for different RNA types.
Conclude that the number of distinct RNA polymerases in prokaryotic cells is 1.
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