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Q.84 An actively growing culture (20 ml) of E. coli (1 × 105 per ml) was mixed with a total of 100 T4 phage particles, grown further for 40 min and […]

Q.83 Based on their properties, match the “Genera” in Group 1 with those in Group 2 Group 1 P. Bacillus Q. Neisseria R. Rhizobium S. Caulobacter Group 2 1. Sarcina […]

Q.82 A new isolate of a facultative anaerobe utilizes either oxygen or pyruvate as terminal electron acceptor. This bacterium was grown either anaerobically with glucose as sole carbon source; or aerobically […]

Q.81 During replication of the E. coli chromosome, Okazaki fragments are produced from (A) only one of the strands of the circular genome (B) both the strands of the circular genome […]

Q.80 Match the names of investigators in Group 1 with their contributions in Group 2: Group 1 P. Joseph Lister Q. John Needham R. Elie Metchnikoff S. Lazaro Spallanzani Group 2 […]

Q.79 Which of the statements about Corynebacterium diphtheriae biology is NOT CORRECT? (A) All strains of C. diphtheriae are producers of diphtheria toxin (B) Diphtheria toxin production can be minimized by […]

Q.78 An actively growing culture of E. coli divides in about 20 min. Under laboratory conditions, time taken to replicate the entire genome of this bacterium would be about: (A) 20 […]

Q.77 Which one of the following forms of the same DNA molecule would bind maximum ethidium bromide? (A) Negatively supercoiled (B) Covalently closed relaxed circle (C) Linear (D) Positively supercoiled Negatively […]

Q.76 Four Hfr strains of E. coli were generated from the same F+ strain. The Hfr strains donated markers in the following order: Strain 1: DQWMT; Strain 2: AXPTM; Strain 3: […]

Q.75 Which one of the following immersion oils would you use to get the best resolution in a light microscope (with 100× objective)? (A) an oil with refractive index of 1.6 […]