- A) DNA Gyrase introduces negative supercoils and DNA Topoisomerase I removes negative supercoils
- B) DNA Topoisomerase I introduces negative supercoils and DNA Gyrase removes them
- C) both introduce negative supercoils
- D) both remove negative supercoils
GATE Biotechnology
Total MCQ: 47
42 Peptidyl transferase activity resides in
- A) 16S rRNA
- B) 23S rRNA
- C) 5S rRNA
- D) 28S rRNA
43 Antibiotic resistance marker that CANNOT be used in a cloning vector in Gram-negative bacteria is
- A) Streptomycin
- B) Ampicillin
- C) Vancomycin
- D) Kanamycin
44 Program used for essentially local similarity search is
- A) BLAST
- B) RasMol
- C) ExPASy
- D) SWISS-PROT
45 The bacteria known to be naturally competent for transformation of DNA is
- A) Escherichia coli
- B) Bacillus subtilis
- C) Mycobacterium tuberculosis
- D) Yersinia pestis
46 Ames test is used to determine
- A) the mutagenicity of a chemical
- B) carcinogenicity of a chemical
- C) both mutagenicity and carcinogenicity of a chemical
- D) toxicity of a chemical
47 Hybridoma technology is used to produce
- A) monoclonal antibodies
- B) polyclonal antibodies
- C) both monoclonal and polyclonal antibodies
- D) B cells