$A$ geneticist isolates a gene for a specific trait under study; she also isolates the corresponding $mRNA$. Upon comparison,the $mRNA$ is found to contain $1,000$ fewer bases than the $DNA$ sequence. Did the geneticist isolate the wrong $DNA$?

• A
  Yes,$mRNA$ is made from a $DNA$ template and should be the same length as the gene sequence.
• B
  Yes,the $mRNA$ should contain more bases than the $DNA$ sequence because bases flanking the gene are also transcribed.
• C
  No,the final $mRNA$ contains only exons; the introns were removed.
• D
  No,the $mRNA$ was partially degraded after it was transcribed.