When eukaryotic DNA is hybridized with mRNA, the hybrid molecules contain loops of DNA, which are
A) retroviruses.
B) introns.
C) exons.
D) transcripts.
E) puffs.

Question

Quizplus · Accepted Answer

The loops of DNA in the hybrid molecules are introns, which are transcribed into pre-mRNA but are removed through RNA splicing before the final mRNA product is produced. Retroviruses refer to a specific type of RNA virus that carries its genetic material in the form of RNA instead of DNA. Exons are the protein-coding sequences that are expressed in the mRNA, while transcripts refer to the RNA molecules that are produced during transcription. Puffs are swelling regions found on the polytene chromosomes that result from gene amplification in certain tissues.

When Eukaryotic DNA Is Hybridized with MRNA, the Hybrid Molecules