Life Sciences
GATE XL topic:biological-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 571–580 of 1235. Imported answers require independent review unless marked reviewed.
Question 83
Open questionXL-SNAT2 marksNeeds review
Escherichia coli growing under favorable conditions doubles in every 20 minutes. If the initial number of Escherichia coli cells is 100, what will be the logarithmic number of cells at 17th generation? (Answer up to 1 decimal place)
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Open questionXL-SNAT2 marksNeeds review
What will be value of the Numerical Aperture (NA), if aperture angle is 58° and oil immersed objective is used for the process of light microscopy? (Answer up to 1 decimal place)
Consider sin 58° = 0.85 and refractive index of immersion oil used = 1.50.
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Open questionXL-TMCQ1 markNeeds review
Which one of the following organic compounds is composed of only (i) a nitrogen containing base, (ii) a single five-carbon sugar, and (iii) a triphosphate?
Your answerChoose one option.
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Open questionXL-TMCQ1 markNeeds review
Which one of the following animals develops adaptive predator avoidance morphology because of the presence of high predator number in its habitat?
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Open questionXL-TMCQ1 markNeeds review
To which class of Drosophila development genes does fushi tarazu (ftz) belong?
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 88
Open questionXL-TMCQ1 markNeeds review
The action of which class of enzyme inhibitors can be reversed by adding an excess of substrate?
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 89
Open questionXL-TMCQ1 markNeeds review
Mendel deduced the genetic principle of inheritance by experimenting on sweet pea plants. One of the experiments involved crossing plants with two contrasting characters, tall (dominant) and dwarf (recessive), which yielded all tall plants in the first generation. When the same genetic cross was independently repeated by a researcher, only short plants were obtained. Which one of the following can possibly explain the altered outcome?
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 90
Open questionXL-TMSQ1 markNeeds review
Which of the following is/are responsible for reversible receptor–ligand interaction?
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Open questionXL-TMSQ1 markNeeds review
In the human body, which of the following is/are involved in processing of a foreign antigen?
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 92
Open questionXL-TMSQ1 markNeeds review
Animals can be classified as ‘specialists’ or ‘generalists’ with respect to diet and habitat selection. Which of the following organism/s belong/s to the specialist category?
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