If no bands appear on gel after restriction digest what is the first practical check?Restriction digest में gel पर no bands आएँ तो पहला practical check क्या होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: DNA loading and stain visualizationDNA loading और stain visualization
The governing concept is troubleshooting DNA visualization before interpreting a digestion result. If no bands are visible, first verify that DNA was actually loaded into the correct well, that the loading dye and sample were retained in the well, and that the gel was stained or imaged using an appropriate method. The ladder lane is especially useful: if the ladder is also absent, the problem is likely loading, staining, imaging, gel preparation, or electrophoresis rather than the restriction enzyme. Therefore option A is correct. Enzyme name origin and a student roll number cannot reveal a visualization failure, and agar must never be tasted.यहाँ मुख्य सिद्धांत digestion result की व्याख्या करने से पहले DNA visualization की troubleshooting है। यदि gel पर कोई band नहीं दिखता, तो सबसे पहले जाँचें कि DNA सही well में वास्तव में load हुआ था, sample well से बाहर नहीं निकला, loading dye मौजूद था और gel को उचित stain तथा imaging method से देखा गया। Ladder lane बहुत उपयोगी है; यदि ladder भी दिखाई नहीं दे रही, तो समस्या loading, staining, imaging, gel preparation या electrophoresis में हो सकती है, केवल restriction enzyme में नहीं। इसलिए विकल्प A सही है। Enzyme के नाम की उत्पत्ति या student roll number से यह समस्या नहीं पता चलेगी, और agar को कभी चखना नहीं चाहिए।
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