Consensus sequences (short segments of DNA) appear in the boundaries between introns and exons of various genes.These sequences appear to be involved in
A) directing the polymerases to the appropriate place on the DNA for transcription to begin.
B) the splicing of introns out of the RNA.
C) allowing the transcription to stop at the appropriate spot.
D) catalyzing the synthesis of a protein.
E) a proofreading mechanism that minimizes errors.

Question

Quizplus · Accepted Answer

Consensus sequences play a critical role in the splicing of introns out of the RNA. In particular, the consensus sequence at the 5' end of an intron includes the nucleotides GU, and a consensus sequence at the 3' end of an intron includes the nucleotides AG. These sequences are recognized by the spliceosome, a complex of RNA and protein molecules that catalyzes the removal of introns and the joining of exons in the pre-mRNA molecule.

Consensus Sequences (Short Segments of DNA) Appear in the Boundaries