Transcription and RNA Processing

AP Biology· difficulty 2/5

Three modifications of eukaryotic pre-mRNA before export are

A
$Methylation of bases, acetylation, chromatin folding$
B
$Phosphorylation, ubiquitination, glycosylation$
C
$Reverse transcription, packaging into virions$
D
$5' cap, 3' poly(A) tail, splicing of introns$
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Explanation

The 5' cap protects from exonucleases and aids ribosome binding; poly(A) tail stabilizes mRNA; splicing removes introns and joins exons.

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