Post Transcriptional Modification

The expressed sequences of eukaryotic pre-mRNAs are known as

• Exons

• Introns

• Interwening sequences

• regulatory sequences

Some eukaryotic rRNAs are self-splicing indicates that RNA can act as an ______.

• ribosomes

• ribozyme

• proteinases

• none of the above

___________ have well defined 3′ ends terminating in poly(A) tails of ~ 250 nucleotides.

• mRNA

• tRNA

• rRNA

• none of the above

Which of the following is not a type of RNA processing?

• Poly A tail

• splicing

• 5' CAP

• removal of exons

The first post transcriptional RNA processing event is __________

• Tailing

• editing

• capping

• splicing

“A” are added to the nascent RNA in the 3’ end during Polyadenylation by enzyme

• Poly A polymerase

• RNA Polymerase

• Taq Polymerase

• DNA polymerase

Capping is done by the addition of __________

• Methylated A

• Methylated G

• Methylated C

• Methylated T

Importance of polyadenylation

• increase stability of mRNA

• important for translation

• regulates its transport to the cytoplasm

• all of the above

The process of modification of eukaryotic pre mRNA into mature RNA occurs by

• RNA processing

• Transcription

• translation

• replication

The linkage formed in 5’cap of mRNA is

• 5’ ——> 5’

• 5’ ——> 3’

• 3’ ——> 5’

• 3’ ——> 3’