In eukaryotic gene expression, what is the role of alternative splicing?

• A. It removes exons from pre-mRNA to produce a smaller mRNA molecule.
• B. It allows a single gene to code for multiple proteins by varying exon inclusion in the mRNA.
• C. It attaches the poly-A tail to the pre-mRNA.
• D. It prevents mRNA from being exported out of the nucleus.

Answer: (B)