Which Statement About Introns Is Correct? Introns Are

Multiple Choice

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.