Splicing of introns in nuclear mRNA primary transcripts requires:
A) a guanine nucleoside or nucleotide.
B) endoribonucleases.
C) polynucleotide phosphorylase.
D) RNA polymerase II.
E) small nuclear ribonucleoproteins (snRNPs).

Question

Quizplus · Accepted Answer

Splicing of introns in nuclear mRNA primary transcripts requires the participation of small nuclear ribonucleoproteins (snRNPs). These snRNPs recognize specific sequences at the intron-exon boundaries, bringing them together to form a spliceosome complex that catalyzes the excision of introns and the joining of exons.

Splicing of Introns in Nuclear MRNA Primary Transcripts Requires