In the process of transcription sigma factor is important for
Medium
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E. coli has only $4.6 \times 10^{6}$ base pairs and completes the process of replication within 18 minutes; then the average rate of polymerisation is approximately
Wild type E.coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as the sugar. Which one of the following changes take place
$A$ : Peptidyl transfer site is contributed by larger sub-unit of ribosome.
$R$ : The enzyme peptidyl transferase is contributed by both $23S$ and $16S$ ribosomal sub-units.