Question

Which of the following does not occur before a eukaryotic mRNA is exported from the nucleus?

A) The ribosome binds to the mRNA.
B) The mRNA is polyadenylated at its 3' end.
C) 7-methylguanosine is added in a 5'-to-5' linkage to the mRNA.
D) RNA polymerase dissociates.

Answer 1

In eukaryotic cells, the ribosome binds to the mRNA, the mRNA is polyadenylated, and 7-methylguanosine is added before the mRNA is exported from the nucleus. Hence the correct answer is option C

Step-by-step explanation:

In the process of mRNA maturation and export from the nucleus in eukaryotic cells, the ribosome binds to the mRNA, the mRNA is polyadenylated at its 3' end with a poly-A tail, and 7-methylguanosine is added in a 5'-to-5' linkage to the mRNA as a cap. These modifications protect the mRNA from degradation and help in its export to the cytoplasm. The dissociation of RNA polymerase occurs during transcription, before the mRNA undergoes these modifications.

Hence the correct answer is option C