Which step in the molecular testing process is used to assess DNA integrity, presence of inhibitors, and purity?

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Multiple Choice

Which step in the molecular testing process is used to assess DNA integrity, presence of inhibitors, and purity?

Quality control of the DNA sample is the step that checks whether the DNA is intact, free of inhibitors, and of sufficient purity to yield reliable results in downstream assays. This evaluation looks at three things: DNA integrity, to ensure the template isn’t heavily degraded; presence of inhibitors, to detect substances that could block the amplification enzymes; and purity, usually assessed with purity ratios from spectrophotometry (such as A260/280 and A260/230) and sometimes by a small test amplification or gel check. If the DNA is degraded, contaminated, or has inhibitors, the downstream amplification may fail or give unreliable results, so this quality check determines whether the sample is suitable for the next steps or needs further purification. The extraction step simply isolates DNA, the amplification step produces many copies of the target, and visualization typically refers to examining the results after amplification, not assessing input DNA quality.

Quality control of the DNA sample is the step that checks whether the DNA is intact, free of inhibitors, and of sufficient purity to yield reliable results in downstream assays. This evaluation looks at three things: DNA integrity, to ensure the template isn’t heavily degraded; presence of inhibitors, to detect substances that could block the amplification enzymes; and purity, usually assessed with purity ratios from spectrophotometry (such as A260/280 and A260/230) and sometimes by a small test amplification or gel check. If the DNA is degraded, contaminated, or has inhibitors, the downstream amplification may fail or give unreliable results, so this quality check determines whether the sample is suitable for the next steps or needs further purification. The extraction step simply isolates DNA, the amplification step produces many copies of the target, and visualization typically refers to examining the results after amplification, not assessing input DNA quality.

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