Genes containing intervening sequences (or introns)
A) are rare in eukaryotic cells.
B) code for mRNA precursors which must be spliced before translation.
C) must undergo a DNA rearrangement before expression.
D) do not code for proteins.
E) are common in prokaryotes.

Question

Quizplus · Accepted Answer

Genes containing intervening sequences, or introns, are common in eukaryotic cells. These introns do not code for proteins but are instead transcribed into mRNA precursors, which must be spliced before translation can occur. This splicing removes the introns and joins together the remaining exons to form a mature mRNA molecule.

Genes Containing Intervening Sequences (Or Introns)