A long region of genomic DNA is compared with a cDNA. The cDNA sequence is identical to segments, but not all, of the genomic DNA sequence. According to these data which of the following statements best describes the genomic DNA?
A) The sequence contains a protein-coding region.
B) The sequence codes for an rRNA.
C) The sequence is an intron.
D) The sequence is a regulatory region.

Question

Quizplus · Accepted Answer

The cDNA sequence being identical to segments of the genomic DNA indicates that the genomic DNA contains exons, which are the coding regions of genes that are transcribed into mRNA and then translated into protein. Introns, the non-coding regions, are spliced out during mRNA processing and are not present in cDNA.

A Long Region of Genomic DNA Is Compared with a CDNA