Although SnRNA U1 Functions in the Nucleus,it Receives a 5

Question

Although snRNA U1 functions in the nucleus,it receives a 5' cap to enhance its
A)binding to snRNPs.
B)export to the cytoplasm.
C)export to the ER lumen.
D)export out of the cell.
E)binding to the mature mRNA.

Accepted Answer

The 5' cap structure is a modification added to the 5' end of mRNA to protect it from exonucleases, promote translation initiation, and enhance export from the nucleus to the cytoplasm. snRNA U1, which functions in the nucleus, also receives this cap modification, suggesting that it may need to be exported to the cytoplasm for some function. Therefore, choice B, export to the cytoplasm, is the best answer.