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Q.85 Which one of the following statements about gene expression is INCORRECT?(A) DNA is transcribed to mRNA.(B) mRNA can be reverse–transcribed to DNA.(C) mRNA can be translated to protein.(D) Protein […]

Q.84 A fluorescence microscope with an objective lens of numerical aperture (NA) 1.5is used with light of wavelength (λ) 600 nanometers. The lateral resolution limit ofthis microscope rounded off to […]

Q.83 A landfill sample was analyzed by dilution and plating techniques for viablebacterial count. When one gram of the landfill sample was diluted 1 x 10–4 (w/v) ityielded 400 CFU. […]

Q.82 At t = 0, the bacterial cell number is 10,000 cells/mL. At t = 480 minutes, the cellnumber increased to 320,000 cells/mL. The mean generation time during thisexponential growth […]

Q.81 Which of the following is/are TRUE about the Escherichia coli chromosome?(A) It is typically bound by histones(B) It is circular in nature(C) It is found in the nucleoid(D) It […]

Q.80 At root nodules, which of the following C4 organic acid(s) is/are transported acrossthe symbiosome membrane and into bacteroids?(A) Succinate(B) Pyruvate(C) Malate(D) Fumarate Succinate, malate, and fumarate are the primary […]

Q.79 Which of the following is/are consequence(s) of nitrous acid (HNO2) mediateddeamination?(A) Deamination of cytosine, adenine and guanine(B) GC–to–AT transitions(C) AT– to– GC transitions(D) Addition of alkyl group to the […]

Q.78 Which of the following event(s) occur(s) during translation in prokaryotes?(A) tRNA binding to the start codon of mRNA on the 30s subunit of ribosome(B) Anticodon of tRNA binding to […]

Q.77 Which of the following cocci is/are examples of division in one plane?(A) Staphylococci(B) Streptococci(C) Micrococci(D) Diplococci Streptococci divide in one plane, forming chains, making option (B) correct. Diplococci also […]

Q.76 Which of the following is/are active transport mechanism(s) in prokaryotes wherethe substance is chemically altered during transport across the membrane?(A) Group translocation(B) Simple diffusion(C) Facilitated diffusion(D) Osmosis Answer: (A) […]