A gene that contains introns can be made shorter (but remain functional)for genetic engineering purposes by using
A) RNA polymerase to transcribe the gene.
B) a restriction enzyme to cut the gene into shorter pieces.
C) reverse transcriptase to reconstruct the gene from its mRNA.
D) DNA polymerase to reconstruct the gene from its polypeptide product.
E) DNA ligase to put together fragments of the DNA that code for a particular polypeptide.

Question

Quizplus · Accepted Answer

Reverse transcriptase can be used to make a DNA copy of an mRNA molecule. Since mRNA is produced after introns have been removed during RNA processing, the resulting DNA copy (cDNA) will lack introns, making the gene shorter but still functional for protein coding.

A Gene That Contains Introns Can Be Made Shorter (But