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In bacteria (e.g., E. coli), how many types of DNA-dependent RNA polymerases catalyse all RNA synthesis?
A3 — for mRNA, tRNA, rRNA respectively
BNone — RNA is synthesised by ribosomes
C5
D1 (one polymerase makes all RNAs)
Answer & Solution
Correct answer: D. 1 (one polymerase makes all RNAs)
Bacteria have **a single RNA polymerase** that transcribes all three RNAs (mRNA, tRNA, rRNA). Its specificity is altered by association with **σ (sigma) initiation factor** and **ρ (rho) termination factor**.
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