Transcription and RNA Processing

AP Biology· difficulty 4/5

Pre-mRNA in eukaryotes is processed by all of the following EXCEPT

A
$Removal of the 5' methylguanosine cap$
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B
$Addition of a 5' methylguanosine cap$
C
$Removal of introns by the spliceosome$
D
$Addition of a 3' poly-A tail$

Explanation

The 5' cap is ADDED, not removed; it protects from exonucleases and aids ribosome binding. Splicing, capping, polyadenylation are standard processing steps.

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