In PCR, inadequate DNA extraction most often leads to which outcome?

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Multiple Choice

In PCR, inadequate DNA extraction most often leads to which outcome?

Having enough, quality template DNA is essential for PCR to detect the target. When DNA extraction is inadequate, there isn’t enough target DNA left in the sample, or inhibitors from the extraction process remain in the reaction, blocking the polymerase. The result is no detectable amplification, so the test indicates the target is absent even if it was present originally—this is a false negative. False positives would require contamination or non-specific amplification, not just a lack of proper extraction. An inconclusive result can occur if inhibition varies or is partial, but the typical outcome from insufficient or impaired extraction is a negative result rather than inconclusive. Uninhibited amplification would not occur because the extraction problem tends to hinder, not enhance, amplification.

Having enough, quality template DNA is essential for PCR to detect the target. When DNA extraction is inadequate, there isn’t enough target DNA left in the sample, or inhibitors from the extraction process remain in the reaction, blocking the polymerase. The result is no detectable amplification, so the test indicates the target is absent even if it was present originally—this is a false negative. False positives would require contamination or non-specific amplification, not just a lack of proper extraction. An inconclusive result can occur if inhibition varies or is partial, but the typical outcome from insufficient or impaired extraction is a negative result rather than inconclusive. Uninhibited amplification would not occur because the extraction problem tends to hinder, not enhance, amplification.

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