Life Sciences
GATE XL format:nat PYQs
Build your understanding with focused practice from past exam papers.
Questions 41–50 of 244. Imported answers require independent review unless marked reviewed.
Question 27
Open questionXL-PNAT2 marksNeeds review
Given the standard reduction potentials (E⊖) for the half-cell reactions below, the standard Gibbs free energy of the dissolution of silver chloride in water, at 298 K, is __________ J mol⁻¹ (rounded off to nearest integer).
(Given: Faraday constant, F = 96500 C mol⁻¹; J = C × V)
AgCl(s) + e⁻ → Ag(s) + Cl⁻(aq) ; E⊖ = 0.22 V at 298 K
Ag⁺(aq) + e⁻ → Ag(s) ; E⊖ = 0.80 V at 298 K
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Open questionXL-QNAT1 markNeeds review
A newly identified viral protein contains one long α-helix spanning 60 amino acid residues. The number of main chain H-bonds formed in this helix is _________. (Answer in integer)
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Open questionXL-QNAT1 markNeeds review
In a lactic acid solution at pH 4.8, the concentrations of lactic acid and lactate are 0.01 M and 0.087 M, respectively. The calculated pKa of lactic acid is ________. (Round off to one decimal place)
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Open questionXL-QNAT1 markNeeds review
If a 10 mM solution of a biomolecule in a cuvette of path length 10 mm absorbs 90% of the incident light at 280 nm, the molar extinction coefficient of the biomolecule at this wavelength is __________ M⁻¹cm⁻¹. (Round off to two decimal places)
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Open questionXL-QNAT2 marksNeeds review
In Michaelis-Menten’s equation, if [S] = 15
, then the ratio
is __________.
(Round off to three decimal places)Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 45
Open questionXL-QNAT2 marksNeeds review
A 520 base-pair long plasmid with 10 negative supercoils would have a linking number of __________, considering 10.5 base pairs per turn for B DNA.
(Answer in integer)
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Open questionXL-QNAT2 marksNeeds review
The spectrum of a protein obtained using electrospray ionization mass spectrometry (ESI-MS) is shown below. Two peaks, one at m/z = 296.0 and the other at m/z = 3552.5, are marked. The mass of the protein associated with the m/z = 296.0 peak is __________ Da. (Round off to two decimal places)
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Open questionXL-RNAT1 markNeeds review
In Calvin-Benson cycle, to produce 1 molecule of glyceraldehyde 3-phosphate by fixing 3 molecules of carbon dioxide, 9 molecules of ATP and ______ molecules (in integer) of NADPH are typically utilized.
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Open questionXL-RNAT2 marksNeeds review
In a genetic cross between two pure-line parents differing in the two independent segregating traits, plant height (tall vs dwarf) and flower color (purple vs white), all the F1 plants were tall with purple flowers. In a testcross population involving these F1 individuals, the expected percentage (%) of dwarf plants with purple flower would be ______ (in integer).
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Open questionXL-RNAT2 marksNeeds review
The mRNA of a hypothetical plant gene HSDU is 800-nucleotide long and encodes a protein of 160 amino acid residues. The calculated length of HSDU CDS would be ______ nucleotides (in integer).
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