Which statement about introns is correct? Introns are:
A) noncoding sequences which interrupt the coding sequences of genes.
B) nontranscribed sequences which interrupt the transcribed sequences of genes.
C) regulatory elements which determine the efficiency of transcription.
D) common to the genes of all organisms.
E) unstable genetic elements which transpose randomly throughout the genome.

Question

Quizplus · Accepted Answer

Introns are noncoding sequences that interrupt the coding sequence of genes. They are transcribed into RNA but then spliced out before the final mRNA product is produced. This allows for alternative splicing, resulting in multiple protein products from a single gene. Introns are not regulatory elements and their presence and size can vary among species and even within different genes in the same organism. They are also not unstable genetic elements that transpose randomly throughout the genome.

Which Statement About Introns Is Correct? Introns Are