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Q.68 Which part of the lipopolysaccharides has toxic properties that make some bacterialinfections a potentially serious medical problem?(A) Polysaccharide side–chains    (B) Lipid A portion(C) Repeat carbohydrate units      […]

Q.67 Which of the following radiation methods is used in preserving food from spoilage bymicroorganisms?(A) Radio waves (B) Microwaves (C) Non–ionizing (D) Ionizing Ionizing radiation effectively preserves food by destroying […]

Q.66 Chloramphenicol and tetracycline are broad spectrum antibiotics which inhibit bacterialgrowth by targeting _________.(A) cell wall synthesis      (B) protein synthesis(C) RNA synthesis           (D) DNA […]

Q.65 A cell in G1 of Interphase has 12 chromosomes. In Anaphase–I of meiosis, the number ofDNA molecules per cell will be__________ A cell in G1 interphase with 12 chromosomes […]

Q.64 Plant weight is determined by a pair of alleles at each of the two independently assortingloci (Aa and Bb) that are additive and equal in their effects. The recessive […]

Q.63 Which one of the following methods is INCORRECT with respect to haploid plantproduction? It can be produced(A) from an unfertilized egg cell(B) from nucellar tissue(C) from isolated pollen culture(D) by […]

Q.62 Which one of the following statements is CORRECT with respect to endospermdevelopment? It originates(A) from the fusion product of three haploid nuclei – one from male gametophyte and twofrom […]

Q.61 Match the options in Group I with that of Group II with respect to steps in signaltransduction mechanism in plantsGroup I                  […]

Q.60 Match the disease with causative organism and affected crop Disease Causative organism Crop P. Powdery mildew 1. Albugo candida i. Corn Q. White rust 2. Phytophthora infestans ii. Tomato […]

Q.59 Cybrids may arise through the(A) fusion of a normal protoplast with another nucleated protoplast of different origin(B) fusion between a normal protoplast and a protoplast containing viable nucleus(C) elimination […]