What is a key difference between eukaryotic and prokaryotic gene expression?

In eukaryotes, which mechanism operates after transcription, but before translation of mRNA into protein?

Which accurately describes the usual process of eukaryotic transcription?

Which statement correctly describes mRNA processing?

Two different proteins with mostly different structures are translated from two different mRNAs. These mRNAs, however, were transcribed from the same gene. Which mechanism could best account for this?

Splicing begins:a. as transcription occurs.b. after transcription is complete.c. as translation occurs.d. after translation is complete.

Compared with mRNAs that have a cap and tail, predict what will be observed if a eukaryotic mRNA lacked a cap and poly(A) tail.a. The primary transcript would not be processed properly.b. Translation would occur inefficiently.c. Enzymes on the ribosome would add a cap and poly(A) tail.d. tRNAs would become more resistant to degradation.

Which of the following is true of RNA processing? (A) Exons are cut out before mRNA leaves the nucleus. (B) Nucleotides are added at both ends of the RNA. (C) Ribozymes may function in the addition of a 5′ cap. (D) RNA splicing adds a poly-A tail to the mRNA.

Which of the following is not true of RNA processing?a. Exons are cut out before mRNA leaves the nucleus.b. Nucleotides may be added at both ends of the RNA.c. Ribozymes may function in RNA splicing.d. RNA splicing can be catalyzed by spliceosomes.