Practice focused topic-wise MCQs with answers and explanations for quick revision and exam preparation.
Difficulty select karke sirf is topic ke focused MCQs practice karein. Score, timer aur explanations student-friendly flow me milenge.
Showing 161-170 of 294 questions.
Which enzyme can be useful for breaking plant cell wall?
C. cellulase
Plant cell wall में cellulose पाया जाता है। Cellulase cellulose को तोड़ने में मदद कर सकता है। / Plant cell wall contains cellulose. Cellulase can help break cellulose.
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Why is chitinase useful in fungal DNA extraction?
D. क्योंकि fungal wall में chitin हो सकता हैBecause fungal wall may contain chitin
Fungal cell wall में chitin हो सकता है। Chitinase wall disruption में मदद करता है। / Fungal cell wall may contain chitin. Chitinase helps in wall disruption.
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How does Proteinase K help in DNA isolation?
A. प्रोटीन और nucleases को degrade करकेBy degrading proteins and nucleases
Proteinase K protein contamination और nuclease activity कम करने में मदद करता है। इससे DNA purity और protection बेहतर होती है। / Proteinase K helps reduce protein contamination and nuclease activity. This improves DNA purity and protection.
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Which contamination does RNase treatment reduce in a DNA sample?
B. RNA contamination
RNase RNA को degrade करता है। इससे DNA sample अधिक साफ बनता है। / RNase degrades RNA. This makes the DNA sample cleaner.
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Why is it necessary to protect a DNA sample from DNase?
C. DNase DNA को degrade कर सकता हैDNase can degrade DNA
DNase DNA को छोटे fragments में तोड़ सकता है। इसलिए nuclease-free handling जरूरी है। / DNase can break DNA into smaller fragments. Therefore nuclease-free handling is important.
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How does EDTA reduce nuclease activity in DNA isolation?
D. धातु ions को chelate करकेBy chelating metal ions
कई nucleases को magnesium जैसे ions चाहिए होते हैं। EDTA इन्हें bind कर activity घटाता है। / Many nucleases need ions such as magnesium. EDTA binds them and reduces activity.
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What is the main role of Tris buffer in a DNA solution?
A. pH स्थिर रखनाMaintaining pH
Tris pH को स्थिर रखने में मदद करता है। उचित pH DNA stability के लिए important है। / Tris helps maintain pH. Proper pH is important for DNA stability.
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What are T and E in TE buffer linked with?
B. Tris और EDTATris and EDTA
TE buffer में Tris pH maintain करता है और EDTA nucleases से protection देता है। इसे storage buffer से जोड़ें। / In TE buffer Tris maintains pH and EDTA gives protection from nucleases. Link it with storage buffer.
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Why is salt added in DNA precipitation?
C. DNA charges को shield करनाTo shield DNA charges
Salt DNA के negative charges को shield करता है। इससे alcohol में DNA precipitate होने में मदद मिलती है। / Salt shields negative charges of DNA. This helps DNA precipitate in alcohol.
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Sodium acetate is linked with which role in DNA precipitation?
D. ion support for precipitation
Sodium acetate ions provide कर DNA precipitation में मदद करता है। Alcohol के साथ DNA recovery बेहतर हो सकती है। / Sodium acetate provides ions and helps DNA precipitation. With alcohol DNA recovery can improve.
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