The aminoacyl-tRNAsynthetases (AARSS) in an organism have evolved to catalyseaminoacylation of their cognate tRNAs (1) either at the 3′-OH or 2′-OH positions of the adenosine at the CCA end. (2) […]
Tag: DNA REPAIR AND RECOMBINATION PYQ
DNA REPAIR AND RECOMBINATION PYQ
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CSIR NET Life Science Previous Year Questions and Solution on DNA REPAIR AND RECOMBINATION
DNA Repair-Deficient Bacteria Produce More Antibiotic-Resistant Mutants, But Wild-Type Cells Also Generate Resistance
A bacterial culture initiated from a single bacterial cell with a DNA repair- deficient system is inoculated into several individual test tubes and allowed to grow in parallel. Wild type […]
CSIR NET Life Science Previous Year Questions and Solution on DNA REPAIR AND RECOMBINATION
Key Features of the E. coli SOS Response: Role of RecA, LexA, and Translesion Polymerases
The following statements are made about the E.coli SOS response to DNA damage: A. RecA-DNA filament complex stimulates the autoproteolytic activity of the Lex A repressor. B. RecA is activated […]
CSIR NET Life Science Previous Year Questions and Solution on DNA REPAIR AND RECOMBINATION
UV Exposure Is a Primary Inducer of the Bacterial SOS Response: Mechanisms and Implications
Which of the following can induce SOS response in bacteria (1) UV exposure (2) Hydroxyl-amine (3) 5-Fluro-Uracil (4) 2-Aminopurine Which Agents Induce the SOS Response in Bacteria? UV Exposure and […]
CSIR NET Life Science Previous Year Questions and Solution on DNA REPAIR AND RECOMBINATION
Lesion Bypass Prevents Replication Fork Collapse Caused by UV-Induced DNA Damage
UB-induced DNA damage cause advancing replication forks to stall. To avoid a collapse of these stalled replication forks the cell uses: (1) non-homologous end joining (2) lesion bypasss (3) mismatch […]
CSIR NET Life Science Previous Year Questions and Solution on DNA REPAIR AND RECOMBINATION
How TLS DNA Polymerases Reduce Replicative Fidelity by 100-Fold During DNA Damage Bypass
How Translesion Synthesis (TLS) DNA Polymerases Reduce Replicative Fidelity by 100-Fold DNA replication fidelity is critical for genome stability. However, when DNA damage blocks replicative polymerases, cells employ specialized DNA […]
CSIR NET Life Science Previous Year Questions and Solution on DNA REPAIR AND RECOMBINATION
Key Steps of Double-Strand Break Repair (DSBR) Model in Homologous Recombination Explained
Following statements are made about double-strand break repair (DSBR)model of homologous recombination: A. Process of DSBR recombination is triggered by introducing a double-strand break in a DNA duplex B. In […]
CSIR NET Life Science Previous Year Questions and Solution on DNA REPAIR AND RECOMBINATION
RuvB Protein Catalyzes Branch Migration Activity in the Holliday Junction During DNA Recombination
Which one of the following proteins catalyzes branch migration activity in Holliday Junction? (1) Spo11 (2) RuvB (3) Zip1 (4) RuvC Which Protein Catalyzes Branch Migration Activity in the Holliday […]
CSIR NET Life Science Previous Year Questions and Solution on DNA REPAIR AND RECOMBINATION
Roles of E. coli RecA and DnaB Genes: DNA Repair, SOS Response, and DNA Unwinding Explained
In E. coil, recA gene is involved in recombination as well as repair and dnaB gene is involved in unwinding of DNA double strands during replication. Which of the following […]
CSIR NET Life Science Previous Year Questions and Solution on DNA REPAIR AND RECOMBINATION
Recombination Repair Explained: Why Topoisomerase II Does Not Catalyze Homologous Recombination
The homologous genetic recombination is a DNA repair process referred to as recombination repair. Which one of the following statements is INCORRECT for recombination repair? (1) DNA polymerase III stalls […]
