Which of the following is an application of the polymerase chain reaction?
- A. Taking X ray images
- B. Transfusing blood
- C. Dialysing a patient's blood
- D. Detecting a virus from a tiny sample of its DNA
Explanation
PCR amplifies trace DNA millions of times, making it detectable in diagnosis, forensics and research. The other options are medical procedures that involve no DNA amplification.
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