CDNA Libraries are Desirable for the Expression of Eukaryotic Genes

Question

cDNA libraries are desirable for the expression of eukaryotic genes in prokaryotes because
A) prokaryotes have no mRNA.
B) prokaryotes cannot remove introns.
C) prokaryotes cannot remove exons.
D) prokaryotes do not have the nucleotide thymine.
E) prokaryotes can only use uracil.

Accepted Answer

Prokaryotes are unable to remove introns, which are non-coding regions of mRNA that must be removed before translation into protein. cDNA libraries are constructed from mRNA, which has already had introns removed, making it a desirable template for expression in prokaryotes.