How does the introduction of certain toxins, such as PR toxins, help investigate the speed of pre-mRNA splicing?

Which of the following is not included in the functions of the 5' cap and poly-A tail in mRNA?

Which of the following statements about RNA processing is false? 

The ______________ of eukaryotic cells separates transcription and translation in both space and time.

The eukaryotic pre-mRNA undergoes all of the following except