Chapter 8 Flashcards
identifies the correct sites for transcription initiation.
σ subunit
gene sequence to which RNA polymerase binds to initiate transcription.
promoter
Promoters are ___ nucleotides long and are located at 10 and 35 base pairs upstream of the transcription start site.
six
During elongation, polymerase maintains an unwound region of about _____ base pairs.
15
The most common stop signal in E coli.
GC-rich sequence followed by seven A residues.
Transcription of the GC-rich inverted repeat results in a segment of RNA that can form a stable _______ structure.
stem-loop
synthesizes mRNA and has been the focus of most transcription studies.
RNA poly II
proteins involved in transcription from polymerase II promoters.
general transcription factors
the –10 sequence of bacterial promoters.
TATA box
a protein complex of more than 20 subunits; interacts with: general transcription factors and RNA polymerase.
mediator
Genes for tRNAs, 5S rRNA, and some of the small RNAs are transcribed by
RNA poly III
an enzyme in which RNA rather than protein is responsible for catalytic activity.
ribozyme
Processing of the 3′ end of tRNAs ends with addition of a ____
CCA
In eukaryotes, pre-mRNAs are extensively modified_____ export from the nucleus.
before
very stable, in both prokaryotes and eukaryotes.
rRNAs and tRNAs
