Intervening sequences (introns) are
A) found in cDNA clones.
B) only found in eukaryotic DNA.
C) removed during DNA replication.
D) found in genomic DNA and hnRNA.
E) added to mRNA by the spliceosome.

Question

Quizplus · Accepted Answer

Intervening sequences, also known as introns, are only found in eukaryotic genomic DNA and hnRNA (heterogeneous nuclear RNA). They are removed through the process of RNA splicing, which occurs during transcription to form mature mRNA molecules without introns. In contrast, cDNA clones are produced from mature mRNA molecules and do not contain introns. Therefore, choice D is the best answer.

Intervening Sequences (Introns) Are