Below Is a List of Steps of Intron Removal and Splicing

question 22

Multiple Choice

Below is a list of steps of intron removal and splicing during pre-mRNA processing. Please select the choice that lists the steps in the CORRECT sequential order. 1. Attachment of snRNP U1 to the 5'splice site
2) Transcription of the DNA template into the pre-mRNA molecule
3) Release of lariat structure
4) Splicing together of exons
5) Transesterification reaction at the branch point adenine

• A) 1, 2, 3, 4, 5
• B) 4, 1, 3, 5, 2
• C) 2, 1, 5, 3, 4
• D) 3, 5, 1, 2, 4
• E) 5, 3, 4, 1, 2