Life Sciences
GATE XL format:nat PYQs
Build your understanding with focused practice from past exam papers.
Questions 191–200 of 244. Imported answers require independent review unless marked reviewed.
Question 13
Open questionXL-PNAT2 marksNeeds review
The solubility product (Kₛₚ) of Mg(OH)₂ at 25 °C is 5.6 × 10⁻¹¹. Its solubility in water is S × 10⁻² g/L, where the value of S is ______ (up to two decimal places).
(Given: Molecular weight of Mg(OH)₂ = 58.3 g mol⁻¹)
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Open questionXL-PNAT2 marksNeeds review
The activation energy (Eₐ) values for two reactions carried out at 25 °C differ by 5.0 kJ mol⁻¹. If the pre-exponential factors (A₁ and A₂) for these two reactions are of the same magnitude, the ratio of rate constants (k₁/k₂) is ______ (up to two decimal places).
(Given: Gas constant R = 8.314 J K⁻¹ mol⁻¹)
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Open questionXL-PNAT2 marksNeeds review
One mole of helium gas in an isolated system undergoes a reversible isothermal expansion at 25 °C from an initial volume of 2.0 liters to a final volume of 10.0 liters. The change in entropy (ΔS) of the surroundings is ______ J K⁻¹ (up to two decimal places).
(Given: Gas constant R = 8.314 J K⁻¹ mol⁻¹)
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Open questionXL-QNAT1 markNeeds review
The number of NADP⁺ molecules required to completely oxidize one molecule of glucose to CO₂ through pentose phosphate pathway is ____ (correct to integer number).
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Open questionXL-QNAT1 markNeeds review
Measurement of the absorbance of a solution containing NADH in a path length of 1 cm cuvette at 340 nm shows the value of 0.31. The molar extinction coefficient of NADH is 620 M⁻¹ cm⁻¹. The concentration of NADH in the solution is ___ μM (correct to integer number).
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Open questionXL-QNAT2 marksNeeds review
A polymerase reaction is carried out for 10 cycles in a volume of 1 ml with 5 molecules of template DNA. Assuming that the efficiency of the reaction is 100 %, the number of molecules of DNA present in 100 μl at the end of the reaction is ___ (correct to integer number).
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Open questionXL-QNAT2 marksNeeds review
The secondary structure topology diagram of 400 amino acid long “Protein-X” is depicted in the figure. The start and end amino acid residue numbers of each α-helix are marked. The percentage (correct to integer number) of residues forming α-helix is ___.
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Open questionXL-QNAT2 marksNeeds review
An enzyme follows Michaelis-Menten kinetics with substrate S. The fraction of the maximum velocity (Vₘₐₓ) will be observed with the substrate concentration [S] = 4Kₘ is ___ (correct to one decimal place). (Kₘ is Michaelis-Menten constant)
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Open questionXL-QNAT2 marksNeeds review
The mass spectrum of benzoic acid will generate the fragment as a base peak (100% relative abundance) of m/z (mass to charge ratio) at ___ (correct to integer number).
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Open questionXL-QNAT2 marksNeeds review
The standard free energy (ΔG′) values of reactions catalyzed by citrate lyase and citrate synthase are -670 and -8192 cal/mol, respectively.
Citrate ⇌ Acetate + Oxaloacetate ΔG₁′ = -670 cal/mole
Acetyl-CoA + Oxaloacetate + H₂O ⇌ Citrate + CoA ΔG₂′ = -8192 cal/mole
The standard free energy (in cal/mol) of acetyl-CoA hydrolysis is ___ (correct to integer number).
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