$\text {Genes and RNA transcripts differ in length.}$ Figure 172
-Refer to Figure 17

$\text {Genes and RNA transcripts differ in length.}$
Figure 17.2
-Refer to Figure 17.2. The mRNA is smaller than the length of the DNA that codes for it because

A) post- transcriptional modification removes the exons.
B) the regulatory regions introns) of the gene are not transcribed.
C) post- transcriptional modification removes the introns.
D) bases are added to the tail of the primary transcript.