Practice Quiz 5, Exam 5 Flashcards
The first modification of the primary transcript produced by RNA Polymerase II is the first attachment of a 5’-5’ triphosphate bridged
7-methyl G- cap
The codon sections of a primary transcript are called
Exons
Miscoded sections of a primary transcript that must be removed are
Introns
Processing of mRNA’s in which some parts are cut out and others put together is organized and directed by what in most eukaryotes
snRNP
The first step of intron excision involves the covalent transfer of the 5’ end of the intron to an internal
G-A 5’-2’ branch point
As exons are ligated together, the intron is released as a
Lariat intermediate
The appearance of what in the mRNA/template double strand activates the transcriptional terminator (TT) to cleave the mRNA
AAUUAAA
What is added to the 3’ end of the maturing mRNA after termination
polyA
Eukaryotic cells protect themselves from invasive parasitic sequencing by producing
RNase
Eukaryotic mRNA’s are increased in stability through protection by
PABP
The mRNA of what has a short life during G1 through its lack of a polyA tail
Histone
One model that serves to explain the possible origin of non coding sections of RNA existing between coding sections is the observation of surviving
self-splicing introns
In mature mRNA’s, the 5’ cap is required for the binding of what which allows the small ribosome subunit to begin searching for the initiation codon
elF4
