AP Biology FRQ Friday (2016 #4)

In eukaryotic gene expression, what are the non-coding regions of a primary RNA transcript that are removed during RNA processing?

• Exons

• Introns

• Promoters

• Terminators

Besides intron removal, what other modifications are mentioned as part of RNA processing in eukaryotes?

• Addition of a 3' cap and removal of exons

• Addition of a 5' cap and a poly-A tail

• Methylation of DNA and histone acetylation

• Protein folding and glycosylation

What modification accounts for the difference in length between a 15 kilobase (kb) primary transcript and a 7 kb mature mRNA in a eukaryotic cell, and where does this modification occur?

• Addition of a poly-A tail in the cytoplasm

• Splicing out of introns in the nucleus

• Removal of exons in the ribosome

• Addition of a 5' cap in the mitochondria

A eukaryotic gene with a primary transcript of 15 kilobases (kb) is introduced and expressed in a prokaryotic cell. What would be the predicted length of the mature mRNA produced in the prokaryotic cell?

• 7 kb

• 15 kb

• Less than 7 kb

• Greater than 15 kb