Reverse transcriptase PCR (RT-PCR) is a technique that uses reverse transcription to produce a DNA template from RNA.

Reverse transcriptase PCR (RT-PCR) is a technique that uses reverse transcription to produce a DNA template from RNA.

• A. Uses RNA as a template to create DNA.
• B. Uses DNA to create RNA.
• C. Uses protein to create RNA.
• D. Inhibits transcription.

Answer: (A)

The key idea is that reverse transcriptase uses RNA as a template to synthesize DNA. In RT-PCR, this reverse transcription step creates complementary DNA (cDNA) from the RNA present in the sample, because DNA polymerases used in the PCR phase need a DNA template to copy. After the cDNA is made, standard PCR amplifies this DNA, allowing detection or quantification of the original RNA sequence. So the process starts with RNA, which is converted into DNA, then that DNA is amplified. It’s not about using DNA to make RNA, not about proteins making RNA, and it doesn’t involve inhibiting transcription.

The key idea is that reverse transcriptase uses RNA as a template to synthesize DNA. In RT-PCR, this reverse transcription step creates complementary DNA (cDNA) from the RNA present in the sample, because DNA polymerases used in the PCR phase need a DNA template to copy. After the cDNA is made, standard PCR amplifies this DNA, allowing detection or quantification of the original RNA sequence.

So the process starts with RNA, which is converted into DNA, then that DNA is amplified. It’s not about using DNA to make RNA, not about proteins making RNA, and it doesn’t involve inhibiting transcription.