What roles do the 5' cap and 3' poly-A tail play in mRNA function?
- Acheck_circle
They protect the mRNA from exonuclease degradation and aid in nuclear export and ribosome binding.
- B
They mark the mRNA for degradation.
- C
They serve as splice donor and acceptor sites.
- D
They are translated as protein extensions.
Explanation
The 7-methylguanosine cap and poly-A tail stabilize mRNA against exonucleases, facilitate nuclear export, and promote ribosome recruitment for translation.