Question

What is cDNA?

Answer 1

It is a `"DNA"` molecule synthesized from template `mRNA` in reverse transcription

Explanation:

`"cDNA or complementary DNA"` has nucleotide sequence complementary to the processed `"mRNA` from which it has been synthesized in a process called reverse transcription that is catalyzed by enzyme i.e reverse transcriptase.

`cDNA` being synthesized from single stranded `"mRNA"` is firstly synthesized as a single stranded molecule. And it remains single stranded until `"PCR(polymerase chain reaction)"` is carried out. In PCR that is aided by `"DNA polymerase"` (e.g Taq DNA polymerase) , it gets it's double stranded form.

http://evrogen.com/technologies/Mint-cDNA-synthesis.shtml

Hope it helps...