Life Sciences
GATE XL purpose:exam-prep PYQs
Build your understanding with focused practice from past exam papers.
Questions 1021–1030 of 1235. Imported answers require independent review unless marked reviewed.
Question 11
Open questionXL-QMCQ2 marksNeeds review
Among the reagents given below which one of the combination of reagents will NOT break the disulphide bonds in the immunoglobulin molecules?
(P) Reduced glutathione (Q) Dithiothreitol
(R) Sodium dodecyl sulphate (S) Methionine
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Open questionXL-QMCQ2 marksNeeds review
Match the protein elution condition given in Group I with the appropriate chromatography matrices from Group II.
Group I:
P: Increasing concentration of sodium chloride
Q: Increasing concentration of histidine
R: Decreasing concentration of ammonium sulphate
S: Decreasing concentration of H⁺
Group II:
i: Phenyl-Sepharose
ii: Chromatofocusing
iii: DEAE-Sepharose
iv: Ni-NTA
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Which one of the following is NOT a neurotransmitter?
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The type-II hypersensitivity reaction is mainly mediated by____.
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Which one of the following reaction mechanisms drives the conversion of low energy 3-phosphoglyceraldehyde to high energy 1,3-bisphosphoglycerate?
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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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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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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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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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