Under which of these conditions would scientists use the polymerase chain reaction (PCR) before they analyze a DNA sample?
A
The DNA sample comes from a bacterium or virus,
B. The DNA sample has been cut into fragments by restriction enzymes.
COnly a small amount of the DNA sample is available,
D.
The DNA sample includes regions that are transcribed into mRNA,
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Under which of these conditions would scientists use the polymerase chain reaction (PCR) before they...
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