Life Sciences
GATE XL topic:life-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 1181–1190 of 1235. Imported answers require independent review unless marked reviewed.
Question 71
Open questionXL-SNAT2 marksNeeds review
One-ml sample of a bacterial culture was serially diluted to
times, and 46 colonies were obtained after plating this diluted sample on an agar medium. The number of cells present per ml in the diluted original sample were ______.Log in to check the answer
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Open questionXL-SNAT2 marksNeeds review
The transformation efficiency of competent cells prepared in a laboratory is
CFU/μg of plasmid DNA. If 0.01 μg of this plasmid is used to transform these competent cells, the number of transformed bacteria in CFU after plating will be ______.Log in to check the answer
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Open questionXL-SNAT2 marksNeeds review
Assume that the average DNA content of a single microbial cell is 4 femtogram. A soil sample analyzed for its microbial community DNA is found to contain 0.32 μg DNA per gram of the soil. The number of microbial cells per milligram of the soil are ______.
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Open questionXL-SNAT2 marksNeeds review
Assume that a bacterial culture has a mean generation time of 2 hours. If the number of bacteria present after 24 hours of culture are
, the initial number of bacteria present were ______.Log in to check the answer
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Open questionXL-SMCQ2 marksNeeds review
The minimal inhibitory concentration (MIC) of an antibiotic X against Clostridium tetani, Staphylococcus sp., Shigella sp. and Streptococcus sp. is 25, 15, 2 and 1 μg/ml, respectively. Assuming that the bioavailable concentration of X in an animal model is 20 μg/ml, which one of these bacteria may develop resistance against X in the animal model?
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Open questionXL-TMCQ1 markNeeds review
The characteristic feature of deuterostomes is depicted by
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One of the most remarkable features of evolution is the formation of amnion and allantois. This appeared for the “first time” in evolutionary time scale in
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A woman with blood group A gave birth to a baby with blood group AB. The blood group of the father would be
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The enzyme amylase can break alpha glycosidic linkages between glucose monomers. Hence, amylase can digest which one of the following carbohydrates?
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The metabolic pathway which is common to both fermentation and cellular respiration is
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