RNA Splicing: involves removal of introns and recombining exons
• introns (intervening sequences): do not code for proteins; usually contain regulatory regions for transcription
• exons (expressed sequences): code for proteins
Which description applies to alternative mRNA splicing?
a) Protein modifications such as addition of a functional group, or structural changes such as folding.
b) Heritable changes in gene expression that occur without altering the DNA sequence.
c) A gene cluster controlled by a single promoter that transcribes to a single mRNA strand.
d) mRNA modifications such as additions of a 5'-cap and 3' poly-A tail and removal of introns.
e) Processing of exons in mRNA that results in a single gene coding for multiple proteins.
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