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 DNA.
C) allowing transcription to stop at the appropriate spot.
D) catalyzing the synthesis of a protein.
E) providing information to orient RNA polymerase.

Question

Quizplus · Accepted Answer

Consensus sequences are commonly found at the boundaries between introns and exons in genes, and they play a key role in the splicing process that removes introns from pre-mRNA. Specifically, the consensus sequences help identify the start and end points of introns, and also contain signals that recruit the splicing machinery to these regions of the RNA molecule. Therefore, choice B is the best answer. Choices A, C, D, and E are not as directly related to the function of consensus sequences in splicing.

Consensus Sequences (Short Segments of DNA)appear in the Boundaries Between