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Unformatted text preview: romoter can see transciption occurring in some cases. It
needs a lot of ribosomal RNA. this is bounded to
protein. the wavy lines are ribosomal RNA being
synthesized from this gene. Transcription begins at
the top, the shorter RNA are at the top, the bigger
ones are father away. terminator BIO 1140 Unit 2-2: Transcription What about procaryotes?
1. There is usually a single RNApol consisting of multiple subunits.
Different promoters may be recognized by using different
subunits especially “σ” (sigma).
2.There are two termination of transcription systems.
Rho-dependent: a termination factor “ρ” (rho) stops RNA synthesis
at specific sites, causing RNApol stop and to dissociate from the
Intrinsic or rho-independent: RNApol stops at a terminator
sequence (G+C-rich palindrome/ nusA) within the RNA leading to
dissociation of RNApol from the DNA. 20 BIO 1140 Unit 2-2: Transcription Production & Processing of mRNAs in Eukaryotes Eukaryotic protein-coding genes are transcribed into precursor mRNAs that are modified in the nucleus During RNA processing many types of modifications can occur in the nucleus. Not all wi...
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- Winter '07