Life Sciences
GATE XL format:nat PYQs
Build your understanding with focused practice from past exam papers.
Questions 51–60 of 244. Imported answers require independent review unless marked reviewed.
Question 82
Open questionXL-SNAT2 marksNeeds review
At t = 0, the bacterial cell number is 10,000 cells/mL. At t = 480 minutes, the cell number increased to 320,000 cells/mL. The mean generation time during this exponential growth period, rounded off to the nearest integer is ______ minutes.
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Open questionXL-SNAT2 marksNeeds review
A landfill sample was analyzed by dilution and plate techniques for viable bacterial count. When one gram of the landfill sample was diluted 1 × 10⁻⁴ (w/v) it yielded 400 CFU. The viable bacterial count (in million, rounded off to the nearest integer) in one gram landfill sample is ______.
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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 84
Open questionXL-SNAT2 marksNeeds review
A fluorescence microscope with an objective lens of numerical aperture (NA) 1.5 is used with light of wavelength (λ) 600 nanometers. The lateral resolution limit of this microscope rounded off to the nearest integer, is ________ nanometers.
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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-TNAT1 markNeeds review
The human genetic code is triplet in nature with 64 codons made using four nucleotides. If the human genetic code was doublet in nature, the number of codons theoretically possible from four nucleotides is ______. (Answer in integer)
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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 101
Open questionXL-TNAT2 marksNeeds review
Consider the following nucleotide sequence:
5′- GCCCAUGCGUCUACUGCUCGAUCGAGCUCUACGUAUGAUGAA-3′
Assume canonical initiation, canonical termination, no post-translational modification, and the average molecular mass of an amino acid to be 110 daltons. The theoretical molecular mass of the polypeptide translated from the above nucleotide sequence is _____ daltons. (Answer in integer)
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Open questionXL-TNAT2 marksNeeds review
The pKa of a buffer solution with pH of 5, consisting of 0.4 M sodium acetate and 0.04 M acetic acid, is _____. (Answer in integer)
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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 103
Open questionXL-TNAT2 marksNeeds review
Consider a healthy person with the following lung volumes:
Residual volume = 900 mL
Expiratory reserve volume = 800 mL
Tidal volume = 200 mL
If the Total lung capacity is 5500 mL, then the Inspiratory reserve volume of the person is _____ mL. (Answer in integer)
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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 122
Open questionXL-UNAT2 marksNeeds review
A 10 kg tomato pulp is concentrated from an initial moisture content of 90% (wet weight basis) to 35% (wet weight basis). The weight of the concentrate in kg is ________ (round off to 2 decimal places).
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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 17
Open questionXL-PNAT1 markNeeds review
The depression of freezing point of water (in K) for 0.1 molal solutions of NaCl and Na₂SO₄ are ΔT₁ and ΔT₂, respectively. Assuming the solutions to be ideal, the ratio ΔT₁/ΔT₂ is ____________ (rounded off to two decimal places).
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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 18
Open questionXL-PNAT1 markNeeds review
Considering cyclobutane to be planar, the number of planes of symmetry in the following compound is ____________ (in integer).
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