試題詳解

20. Which of the following statements about alternative splicing is correct?
(A) Alternative splicing occurs only in protein-coding genes and excludes noncoding RNA genes.
(B) Alternative splicing is regulated by splice site selection influenced by RNAbinding proteins and cis-regulatory elements.
(C) All alternative splicing events result in functional protein isoforms.
(D) Alternative splicing is primarily limited to the removal of introns without any variation in exon usage.
(E) Alternative splicing is a rare event occurring in only a small fraction of eukaryotic genes.