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For some pre-mRNAs, splicing is regulated by

Question : For some pre-mRNAs, splicing is regulated by : 2134110

26) For some pre-mRNAs, splicing is regulated by

A. RNA polymerase stalling

B. splicing enhancer sequences

C. localization of the pre-mRNA to subnuclear “speckles”

D. transcription termination

27) When an exon from one pre-mRNA joins to an exon from another pre-mRNA the process is called

A. trans-splicing

B. cis-splicing

C. alternative splicing

D. RNA editing

28) RNA editing is a widespread mechanism for post-transcriptional modification of the base sequence of mRNA. In humans, RNA editing

A. is mediated by guide RNAs and a multiprotein complex called the “editosome” that inserts or deletes uridines.

B. occurs by deamination of adenosine to inosine, or cytidine to uridine.

C. is mediated by small nucleolar RNAs and base modification enzymes.

D. is mediated by the U12-type intron splicing pathway.

29) RNA editing is a widespread mechanism for post-transcriptional modification of the base sequence of mRNA. In trypanosomes, RNA editing

A. is mediated by guide RNAs and a multiprotein complex called the “editosome” that inserts or deletes uridines.

B. occurs by deamination of adenosine to inosine, or cytidine to uridine.

C. is mediated by small nucleolar RNAs and base modification enzymes.

D. is mediated by the U12-type intron splicing pathway.

30) The enzyme ADAR (adenosine deaminase acting on RNA) functions in

A. RNA interference

B. RNA editing

C. alternative splicing

D. formation of an alternative mRNA cap structure

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