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Q.14 A neonatally thymectomized mouse, immunized with protein antigen shows (A) Both primary and secondary responses to the antigen (B) Only primary response to the antigen (C) Delayed type hypersensitive […]

Q.13 A culture of bacteria is infected with bacteriophage at a multiplicity of 0.3. The probability of a single cell infected with 3 phages is (A) 0.9 (B) 0.27 (C) […]

Q.12 Interferon-β is produced by (A) Bacteria infected cells (B) Virus infected cells (C) Both virus and bacteria infected cells (D) Fungi infected cells Interferon-β (IFN-β), a type I interferon, […]

Q.11 Which one of the following DOES NOT belong to the domain of Bacteria? (A) Cyanobacteria (B) Proteobacteria (C) Bacteroids (D) Methanobacterium The three-domain system classifies life into Bacteria, Archaea, […]

Q.10 An example for template independent DNA polymerase is (A) DNA Polymerase I (B) RNA polymerase (C) Terminal deoxynucleotidyl transferase (D) DNA polymerase III Template-independent DNA polymerases add nucleotides without […]

Q.9 Under stress conditions bacteria accumulate (A) ppGpp (Guanosine tetraphosphate) (B) pppGpp (Guanosine pentaphosphate) (C) Both ppGpp and pppGpp (D) Either ppGpp or pppGpp Bacteria trigger the stringent response under […]

Q.8 During transcription (A) DNA Gyrase introduces negative supercoils and DNA Topoisomerase I removes negative supercoils (B) DNA Topoisomerase I introduces negative supercoils and DNA Gyrase removes negative supercoils (C) […]

Q.7 In transgenics, alterations in the sequence of nucleotide in genes are due to P. Substitution Q. Deletion R. Insertion S. Rearrangement (A) P and Q (B) P, Q and […]

Q.6 Peptidyl transferase activity resides in (A) 16S rRNA (B) 23S rRNA (C) 5S rRNA (D) 28S rRNA Peptidyl transferase catalyzes peptide bond formation during protein synthesis on ribosomes. This […]

Q.5 Program used for essentially local similarity search is (A) BLAST (B) RasMol (C) ExPASy (D) SWISS-PROT BLAST (Basic Local Alignment Search Tool) dominates bioinformatics for detecting sequence similarities. Tailored […]