Question

how would the cdna created in a lab compare to the original dna? a) it would be circular, similar to bacterial dna. b) it would be identical to the original dna. c) it would contain only the genes that were producing proteins in the cell at the time the cdna was created. d) it would be a single strand instead of the original double - stranded dna.

Explanation:

cDNA (complementary DNA) is synthesized from mRNA using reverse - transcriptase. Since mRNA represents the genes that are being actively transcribed (producing proteins) in a cell at a given time, cDNA contains only those genes. It is not circular like bacterial DNA, not identical to the original DNA (which has introns and non - coding regions not present in mRNA and thus cDNA), and can be double - stranded after synthesis.

Answer:

C) It would contain only the genes that were producing proteins in the cell at the time the cDNA was created.