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Q.21 DNA gyrase can(A) cut single–stranded DNA(B) relax supercoiled DNA(C) introduce negative supercoiling in DNA(D) not utilize ATP DNA gyrase, a type II topoisomerase found in bacteria, primarily introduces negative […]

Q.20 The major product formed in the given reaction is The major product of this reaction is the tert‑butyl‑substituted cyclopentyl aldehyde, i.e. option (D). The mechanism proceeds through diazotization of the […]

Q.19 Match the followingGroup I                                                    […]

Q.18 The bacterium that can tolerate high concentrations of salt and also fermentmannitol is(A) Staphylococcus aureus(B) Staphylococcus epidermis(C) Streptococcus pyogenes(D) Serratia marcescens Staphylococcus aureus is the bacterium that tolerates high salt […]

Q.17 Which of the following enzymes is absent in a person suffering fromAlkaptonuria?(A) Tyrosinase(B) Homogentisic acid oxidase(C) Catechol dioxygenase(D) Phenylalanine hydroxylase Homogentisic acid oxidase is absent in Alkaptonuria. This rare genetic […]

Q.16 A man having a dominant genetic trait (TT genotype) can tastephenylthiocarbamide (PTC), marries a woman who cannot taste PTC. The PTCtasting ability of their biological son and daughter is(A) […]

Q.15 An organism that causes obstruction of lymphatic system in humans is ____.(A) Borrelia burgdorferi(B) Brucella abortus(C) Yersinia pestis(D) Wuchereria bancrofti Wuchereria bancrofti is the correct answer (D). This filarial […]

Q.14 The zone of a pond system where respiration is more than production is calledas _____.(A) Limnetic zone(B) Littoral zone(C) Epilimnion zone(D) Benthic zone The correct answer is (D) Benthic zone. […]

Q.13 A frameshift mutation is caused by ____.(A) 5–Bromouracil(B) Acridine(C) Glutathione(D) Hypoxanthine A frameshift mutation is caused by (B) Acridine. This is the correct answer for the CSIR NET Life Sciences […]

Q.12 Which of the following activity is associated with Klenow fragment?(A) 5′–3′ exonuclease activity(B) 5′–3′ endonuclease activity(C) Polymerase activity(D) 3′–5′ endonuclease activity Answer: (C) Polymerase activity The Klenow fragment retains […]