Multiple choice

Alternative splicing is a regulated process during gene expression that results in a single gene coding for multiple proteins. Which of the following events does NOT occur in alternative splicing during gene expression?

  1. The exons to be retained in the mRNA are determined during the splicing process.

  2. U3 is not involved in mRNA splicing.

  3. Splicing silencers are sites to which splicing repressor proteins bind.

  4. Splicing is regulated by trans-acting proteins.

  5. Each intron has GU at its 3' end.
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E Correct answer
Explanation

The typical eukaryotic nuclear intron has consensus sequences defining important regions.  Near the 3' end there is a branch site.

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