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 171-180 of 294 questions.
Why are ethanol or isopropanol used in DNA extraction?
A. DNA precipitate करने के लिएTo precipitate DNA
Alcohol DNA की solubility घटाता है। Salt की उपस्थिति में DNA precipitate हो सकता है। / Alcohol reduces DNA solubility. In the presence of salt DNA can precipitate.
Login to save your score, XP, coins and progress.
Why is cold alcohol preferred in DNA precipitation?
B. DNA solubility और घटाने के लिएTo further reduce DNA solubility
Cold alcohol DNA precipitation को बेहतर कर सकता है। इससे DNA recovery बढ़ सकती है। / Cold alcohol can improve DNA precipitation. This can increase DNA recovery.
Login to save your score, XP, coins and progress.
Why is a DNA pellet washed with 70 percent ethanol?
C. salts और impurities हटाने के लिएTo remove salts and impurities
70 percent ethanol wash salts और छोटी impurities हटाता है। इसके बाद pellet को सही तरह dry किया जाता है। / A 70 percent ethanol wash removes salts and small impurities. The pellet is then dried properly.
Login to save your score, XP, coins and progress.
Why can residual ethanol be a problem in a DNA sample?
D. यह PCR और enzyme reactions को inhibit कर सकता हैIt can inhibit PCR and enzyme reactions
Bacha हुआ ethanol downstream reactions को रोक सकता है। इसलिए pellet को over-dry किए बिना dry करें। / Remaining ethanol can inhibit downstream reactions. Therefore dry the pellet without over-drying.
Login to save your score, XP, coins and progress.
What problem can occur when a DNA pellet is over-dried?
A. DNA dissolve करना कठिन हो सकता हैDNA may become difficult to dissolve
Over-dried DNA pellet buffer में धीरे घुलता है। उचित drying time जरूरी है। / An over-dried DNA pellet dissolves slowly in buffer. Proper drying time is important.
Login to save your score, XP, coins and progress.
When does DNA bind in silica column DNA purification?
B. suitable salt conditions मेंIn suitable salt conditions
Silica columns में सही salt condition DNA binding कराती है। Wash के बाद DNA elute किया जाता है। / In silica columns proper salt condition allows DNA binding. After washing DNA is eluted.
Login to save your score, XP, coins and progress.
What is the main purpose of the column wash step?
C. bound DNA से impurities हटानाRemoving impurities from bound DNA
Wash step DNA को column पर रखते हुए salts और contaminants हटाता है। इससे eluted DNA साफ होता है। / The wash step removes salts and contaminants while DNA remains on the column. This makes eluted DNA clean.
Login to save your score, XP, coins and progress.
What can be the effect of keeping DNA elution volume low?
A. DNA concentration बढ़ सकती हैDNA concentration can increase
कम volume में वही DNA घुलने से concentration बढ़ सकती है। बहुत कम volume recovery घटा सकता है। / The same DNA in lower volume can give higher concentration. Too little volume can reduce recovery.
Login to save your score, XP, coins and progress.
Why is gel electrophoresis useful in DNA quality check?
B. DNA band और degradation देखने के लिएTo see DNA band and degradation
Gel पर intact DNA band और degradation smear देखे जा सकते हैं। यह integrity check है। / On gel intact DNA band and degradation smear can be seen. This is an integrity check.
Login to save your score, XP, coins and progress.
What can smear in a DNA gel indicate?
C. DNA degradation
Smear टूटे हुए DNA fragments का संकेत हो सकता है। Gentle handling और nuclease protection जरूरी हैं। / Smear can indicate broken DNA fragments. Gentle handling and nuclease protection are necessary.
Login to save your score, XP, coins and progress.
Use Google login or mobile OTP. Admin can block users and control login providers.