As an mRNA molecule is processed in the nucleus, it loses some proteins and binds to new ones, some of which are used in mRNA surveillance pathways. The presence of which of the following molecules on an mRNA is a signal that the mRNA is still NOT ready for nuclear export?
A) Cap-binding complex
B) Exon junction complex
C) snRNPs used in splicing
D) poly-A-binding proteins
E) SR proteins

Question

Quizplus · Accepted Answer

The snRNPs remain associated with the pre-mRNA until it is fully spliced. Their presence indicates that the mRNA is still being processed.

As an MRNA Molecule Is Processed in the Nucleus, It