Multiple choice A cDNA library contains clones representing which of the following? Micro RNA (miRNA) mRNA Genomic DNA Exon Introns Reveal answer Fill a bubble to check yourself B Correct answer Explanation The messenger RNA (mRNA), molecule in cells that carries codes from the DNA in the nucleus to the sites of protein synthesis in the cytoplasm (the ribosomes). cDNA library is created by reverse transcription of mRNA.